init: Load init.carrier.rc for carrier-specific bits

Change-Id: I941230f035182e27bd62316b594ac457316c37b6
Handle policy reloads within ueventd rather than restarting it.

Restarting ueventd upon policy reloads has reportedly created
stability problems for some users and could cause events to be lost.
Stop restarting ueventd and instead handle policy reloads within ueventd.

Also stops restarting installd upon policy reloads.

Change-Id: Ic7f310d69a7c420e48fbc974000cf4a5b9ab4a3b
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Merge remote-tracking branch 'upstream/android-4.4' into android-4.4

Sync with omni