[PATCH v2 1/4] perf test: Keep test result clean if '-v' not set

According to [1], 'perf state' should avoid output too much information if '-v' not set, only 'Ok', 'FAIL' or 'Skip' need to be printed. This patch removes sereval stderr output to make output clean. Before this patch: # perf test dummy 23: Test using a dummy software event to keep tracking

[PATCH v2 1/4] perf test: Keep test result clean if '-v' not set

According to [1], 'perf state' should avoid output too much information if '-v' not set, only 'Ok', 'FAIL' or 'Skip' need to be printed. This patch removes sereval stderr output to make output clean. Before this patch: # perf test dummy 23: Test using a dummy software event to keep tracking