tests: robustness enhancement of regression tests #4433
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Results of some regression tests may vary on diffirent env, due to the unready status of shd process or unexpected output language of key commands in test case.
So, it should be made sure that shd process has got ready before a
gluster v heal
cmd is triggered in testcase. And if the output of command is the judge standard of sub-testcase, we also shuold assure it is shown in specified language as expected.Fixes: #4432