net: Mark removed interfaces with NM_CONTROLLED=no

Change-Id: Iba3c6818ee8f2e843b019cd8ba25d7da3afe2f29
Bug-Url: https://bugzilla.redhat.com/1124876
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30848
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30887
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>