perf tests trace_summary.sh: Run in exclusive mode

perf tests trace_summary.sh: Run in exclusive mode

And it is being successfull only when running alone, probably because
there are some tests that add the vfs_getname probe that gets used by
'perf trace' and alter how it does syscall arg pathname resolution.

This should be removed or made a fallback to the preferred BPF mode of
getting syscall parameters, but till then, run this in exclusive mode.

For reference, here are some of the tests that run close to this one:

  127: perf record offcpu profiling tests                              : Ok
  128: perf all PMU test                                               : Ok
  129: perf stat --bpf-counters test                                   : Ok
  130: Check Arm CoreSight trace data recording and synthesized samples: Skip
  131: Check Arm CoreSight disassembly script completes without errors : Skip
  132: Check Arm SPE trace data recording and synthesized samples      : Skip
  133: Test data symbol                                                : Ok
  134: Miscellaneous Intel PT testing                                  : Skip
  135: test Intel TPEBS counting mode                                  : Skip
  136: perf script task-analyzer tests                                 : Ok
  137: Check open filename arg using perf trace + vfs_getname          : Ok
  138: perf trace summary                                              : Ok

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/aC-hHTgArwlF_zu9@x1
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>