Merge cherrypicks of [4720926, 4723688, 4721047, 4721048, 4721049, 4721050, 4721051, 4722425, 4722426, 4722427] into pi-dr1-release

Change-Id: I78fa8eea3823dfb75577535251a7fde4df06c734
diff --git a/camera/cameraserver/cameraserver.rc b/camera/cameraserver/cameraserver.rc
index fea5a1d..a9aae0b 100644
--- a/camera/cameraserver/cameraserver.rc
+++ b/camera/cameraserver/cameraserver.rc
@@ -4,3 +4,4 @@
     group audio camera input drmrpc
     ioprio rt 4
     writepid /dev/cpuset/camera-daemon/tasks /dev/stune/top-app/tasks
+    rlimit rtprio 10 10