Move StructStat and StructStatVfs now all the callers have switched over.

Change-Id: Ia599ea8d65645eb97c6944743e0a9510991c0607
Merge "Move StructStat and StructStatVfs now all the callers have switched over."
Move ErrnoException into android.system.

Change-Id: Id22bebb6aadeff0729f430fce3f702d974a23efc
Merge "Move ErrnoException into android.system."
Merge remote-tracking branch 'aosp/master' into fml-master