perf tests: Consider subtests when searching for user specified tests

It's now possible to put subtest name as a test filter:

  $ perf test 'PMU event table sanity'
  10: PMU events                                            :
  10.1: PMU event table sanity                              : Ok

Committer testing:

Before:

  $ perf test 'PMU event table sanity'
  $

After:

  $ perf test 'PMU event table sanity'
  10: PMU events                                            :
  10.1: PMU event table sanity                              : Ok
  $

Signed-off-by: Jiri Olsa <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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