Perf profile collection daemon.

Collects system-wide profiles via periodic invocation of
/system/bin/perf, placing the resulting data files in a destination
directory selected via config file.  Behavior of the daemon, e.g how
often to profile, duration of profiling runs, etc, can also be
controlled with config file settings.

Change-Id: I7978cab62aa0c2507ecf8d70ba073e77db730120
52 files changed