simpleperf: fix *no_monitored_threads tests in CTS tests.

simpleperf tests in cts tests has default app package name, which
makes *no_monitored_threads turn to waiting the app process. So
add ScopedAppPackageName to disable app package name in
*no_monitored_threads.

Also use ScopedAppPackageName in stat_cmd.handle_SIGHUP.

Bug: none
Test: run CtsSimpleperfTestCases.
Change-Id: If64d897d5ccbe0f63a6607f1124ce2353d7f6f8e
3 files changed