[inetstack] Remove some dead code

[iyzhang]

We do not use the dead_socket transmission channel any more, so this PR removes it.

[github-actions]

libos = catpowder
commit id = f96960d

collapsed_stack	num_calls	cycles_per_call	nanoseconds_per_call	percent_time
bgc::inetstack::poll_recv;inetstack::layer4_endpoint::poll_once	18930099.80	705.92	309.77	85.41
bgc::inetstack::poll_recv	9465049.90	1660.20	728.62	53.46
bgc::inetstack::tcp::established::background	11053.09	1663.88	733.36	0.20
bgc::inetstack::tcp::established::background;tcp::established::background::acknowledger	11053.09	480.69	215.03	21.78
bgc::inetstack::tcp::established::background;tcp::established::background::retransmitter	11044.43	383.71	168.17	29.27
bgc::inetstack::tcp::established::background;tcp::established::background::sender	11002.55	936.92	411.34	24.96
ioc::network::libos::pop	9033.51	469.11	203.04	0.05
ioc::network::libos::push;inetstack::push	8762.80	6245.08	2739.76	2.41
demikernel::sgafree	8755.36	107.75	48.02	0.02
ioc::network::libos::push	8073.74	33476573.68	15432352.83	40.26
demikernel::push	8073.74	666.32	289.32	0.07
demikernel::sgaalloc	6511.38	171.81	74.96	0.03
demikernel::pop	6038.33	677.93	293.87	0.04
bgc::inetstack::poll_recv;inetstack::poll_bg_work::for::for	5281.58	2545.69	1106.61	1.46
ioc::network::libos::pushto	799.33	4450.37	1939.92	3.53
ioc::network::libos::pushto;inetstack::push	799.33	4022.45	1753.41	90.39
demikernel::pushto	799.33	479.57	209.23	0.37
bgc::inetstack::poll_recv;inetstack::poll_bg_work::for::for;udp::receive	264.67	191.98	86.56	59.90
ioc::network::libos::close	47.77	6271.85	2759.52	0.10
ioc::network::libos::connect	41.86	34572.72	15358.38	0.43
bgc::inetstack::tcp::passiveopen::background	41.86	34404.99	15152.14	0.01
ioc::network::libos::accept	38.29	2196.97	966.92	0.00
demikernel::async_close	32.50	698.58	303.13	0.01
demikernel::accept	21.86	1327.41	580.05	0.00
demikernel::connect	20.93	3868.65	1701.37	0.02
demikernel::socket	10.30	1635.87	716.40	0.00
bgc::inetstack::arp::background	6.38	1975.16	864.56	0.00
bgc::inetstack::poll_recv;inetstack::poll;inetstack::layer4_endpoint::poll_once	2.00	5773.02	2533.12	83.49
bgc::inetstack::icmp::background	1.03	3141.85	1377.80	0.00
demikernel::new	1.00	94219277.32	41332986.81	20.19
demikernel::bind	1.00	26771.75	11603.12	0.00
bgc::inetstack::poll_recv;inetstack::poll	1.00	13752.40	6033.85	0.04
demikernel::listen	1.00	3945.43	1685.35	0.00
demikernel::close	0.00	nan	nan	0.00

[github-actions]

libos = catnap
commit id = f96960d

collapsed_stack	num_calls	cycles_per_call	nanoseconds_per_call	percent_time
bgc::catnap::transport::epoll	13365246.75	2009.81	870.82	33.14
demikernel::sgafree	11534.88	71.06	30.15	0.05
demikernel::sgaalloc	11282.08	120.76	51.25	0.11
ioc::network::libos::push;catnap::linux::transport::push	9066.12	620.32	268.39	3.95
ioc::network::libos::push	8800.49	16495.26	7141.26	6.96
demikernel::push	8800.49	536.06	230.48	0.17
ioc::network::libos::pop;catnap::linux::transport::pop	8022.25	381.31	163.53	3.76
ioc::network::libos::pop	7813.82	21883485.65	9246334.75	24.28
demikernel::pop	7813.82	541.15	230.24	0.13
ioc::network::libos::pushto	560.67	7461.16	3333.88	23.35
ioc::network::libos::pushto;catnap::linux::transport::push	560.67	487.16	216.95	6.52
demikernel::pushto	560.67	453.95	202.75	1.43
demikernel::async_close	32.50	917.98	366.32	0.01
ioc::network::libos::connect	24.95	5509923.29	2315021.68	28.23
ioc::network::libos::connect;catnap::linux::transport::connect	24.95	76459.72	32141.55	2.29
demikernel::connect	24.95	2019.43	855.87	0.01
ioc::network::libos::close	18.35	23211.25	9922.74	0.05
ioc::network::libos::close;catnap::linux::transport::close	18.35	22132.63	9458.64	95.41
demikernel::accept	15.42	1450.99	628.30	0.00
ioc::network::libos::accept	15.39	896975501.16	393157358.86	44.42
ioc::network::libos::accept;catnap::linux::transport::accept	15.39	4591.96	1963.21	0.00
demikernel::socket	9.50	152961.45	65718.26	0.30
demikernel::socket;catnap::linux::transport::socket	9.50	150419.08	64628.55	96.33
demikernel::new	1.00	262261.60	111818.68	0.09
demikernel::bind	1.00	31697.65	13641.31	0.01
demikernel::bind;catnap::linux::transport::bind	1.00	27121.98	11669.86	84.70
demikernel::listen	1.00	15746.08	6766.69	0.00
demikernel::listen;catnap::linux::transport::listen	1.00	14621.37	6284.27	92.78
demikernel::close	0.00	nan	nan	0.00

[github-actions]

libos = catnip
commit id = f96960d

collapsed_stack	num_calls	cycles_per_call	nanoseconds_per_call	percent_time
bgc::inetstack::poll_recv;inetstack::layer4_endpoint::poll_once	29276553.17	338.31	146.33	75.71
bgc::inetstack::poll_recv;inetstack::layer4_endpoint::poll_once;catnip::runtime::receive	29276553.17	196.53	84.95	58.20
bgc::inetstack::poll_recv	14638276.58	900.07	389.83	34.81
bgc::inetstack::tcp::established::background	11055.12	1064.92	454.12	0.11
bgc::inetstack::tcp::established::background;tcp::established::background::acknowledger	11055.12	294.78	125.39	25.32
bgc::inetstack::tcp::established::background;tcp::established::background::retransmitter	11044.75	332.48	143.90	31.73
bgc::inetstack::tcp::established::background;tcp::established::background::sender	11002.75	301.99	121.65	15.30
ioc::network::libos::pop	9038.69	369.90	159.92	0.02
demikernel::sgafree	8764.66	78.77	34.08	0.01
ioc::network::libos::push;inetstack::push	8762.74	1953.83	877.94	0.68
ioc::network::libos::push;inetstack::push;catnip::runtime::transmit	8762.74	304.18	136.27	15.34
ioc::network::libos::push	8073.71	33400734.17	13673948.20	26.02
demikernel::push	8073.71	657.25	288.51	0.04
demikernel::sgaalloc	6518.33	128.15	55.17	0.01
demikernel::pop	6044.86	534.23	229.27	0.02
bgc::inetstack::poll_recv;inetstack::poll_bg_work::for::for	4584.86	2390.62	978.43	2.03
ioc::network::libos::pushto	964.00	1325.19	591.92	0.04
ioc::network::libos::pushto;inetstack::push	964.00	718.50	320.91	54.46
demikernel::pushto	964.00	507.28	226.01	0.02
ioc::network::libos::pushto;inetstack::push;catnip::runtime::transmit	964.00	270.20	120.46	37.50
bgc::inetstack::poll_recv;inetstack::poll_bg_work::for::for;udp::receive	406.33	246.87	107.73	70.57
ioc::network::libos::close	49.38	5879.72	2547.78	0.01
bgc::inetstack::tcp::passiveopen::background	41.86	34772.72	15524.70	0.00
ioc::network::libos::connect	41.86	31043.74	13556.46	0.04
ioc::network::libos::connect;catnip::runtime::transmit	41.86	6579.00	2916.74	22.45
ioc::network::libos::accept	37.96	2275.68	995.65	0.00
demikernel::async_close	32.50	585.33	233.69	0.00
demikernel::accept	21.86	1341.78	588.00	0.00
bgc::inetstack::poll_recv;inetstack::poll_bg_work::for::for;catnip::runtime::transmit	21.09	628.20	273.07	3.41
bgc::inetstack::tcp::passiveopen::background;catnip::runtime::transmit	20.93	18060.53	8079.02	17.62
demikernel::connect	20.93	2608.92	1154.35	0.00
bgc::inetstack::tcp::established::background;tcp::established::background::sender;catnip::runtime::transmit	20.93	592.98	256.69	11.98
demikernel::socket	10.30	1649.91	718.58	0.00
bgc::inetstack::arp::background	6.43	2215.85	953.61	0.00
bgc::inetstack::tcp::established::background;tcp::established::background::acknowledger;catnip::runtime::transmit	5.00	1820.56	743.84	19.42
bgc::inetstack::poll_recv;inetstack::poll;inetstack::layer4_endpoint::poll_once	2.00	20073.17	8673.86	95.26
bgc::inetstack::poll_recv;inetstack::poll;inetstack::layer4_endpoint::poll_once;catnip::runtime::receive	2.00	17952.03	7754.43	89.42
bgc::inetstack::tcp::established::background;tcp::established::background::retransmitter;catnip::runtime::transmit	1.50	311.50	146.88	0.00
bgc::inetstack::icmp::background	1.05	2929.63	1263.98	0.00
demikernel::new	1.00	1763421093.20	761483738.66	48.50
bgc::inetstack::poll_recv;inetstack::poll	1.00	42133.37	18202.59	0.19
demikernel::bind	1.00	11371.12	4882.32	0.00
demikernel::listen	1.00	4423.79	1890.60	0.00
demikernel::close	0.00	nan	nan	0.00