Change /dalvik-cache to be owned by root.

Bug: 16875245

Change-Id: I29a70215a2207bc4e0db02ab751d32a68edf4b66

Conflicts:

	rootdir/init.rc
IMS-VT: Define IMS group.

Define IMS group.

CRs-Fixed: 615689

Conflicts:
	include/private/android_filesystem_config.h

Change-Id: Ie7fed3090a20db1e27a03d2d2cdde443d7ff5435