Merge tag 'android-5.1.0_r1' into HEAD

Android 5.1.0 release 1

Conflicts:
	fs_mgr/fs_mgr.c
	healthd/healthd_mode_charger.cpp
	include/system/audio.h
	rootdir/init.environ.rc.in

Change-Id: I7a11f9aaf2f73854a724392625b0c2719fb2a829