hooks: Update sebool hook to stay in sync w/ vdsm

The sebool specific hook handler got updated to reflect the changes on
the vdsm side.

Change-Id: I88c1605fe10ac1f531ca83e273d63d6b21106ade
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1150243
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>