perf test: Add direct off-cpu tests

Since we added --off-cpu-thresh, add tests for when a sample's off-cpu
time is above the threshold, and when it's below the threshold.

Note that the basic test performed in test_offcpu_basic() collects a
direct sample now, since sleep 1 has duration of 1000ms, higher than the
default value of --off-cpu-thresh of 500ms, resulting in a direct
sample.

An example:

  $ sudo perf test offcpu
  124: perf record offcpu profiling tests                              : Ok
  $

Committer testing:

  root@number:~# perf test offcpu
  126: perf record offcpu profiling tests                              : Ok
  root@number:~# perf test -v offcpu
  126: perf record offcpu profiling tests                              : Ok
  root@number:~# perf test -vv offcpu
  126: perf record offcpu profiling tests:
  --- start ---
  test child forked, pid 1410791
  Checking off-cpu privilege
  Basic off-cpu test
  Basic off-cpu test [Success]
  Child task off-cpu test
  Child task off-cpu test [Success]
  Threshold test (above threshold)
  Threshold test (above threshold) [Success]
  Threshold test (below threshold)
  Threshold test (below threshold) [Success]
  ---- end(0) ----
  126: perf record offcpu profiling tests                              : Ok
  root@number:~#

Suggested-by: Namhyung Kim <[email protected]>
Reviewed-by: Ian Rogers <[email protected]>
Signed-off-by: Howard Chu <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Tested-by: Gautam Menghani <[email protected]>
Tested-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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