add necessary ovirt-node side items to support hosted-engine plugin

- NM support is disabled by default
- selinux module update

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1099149

Change-Id: I602266200b2f062fe299de5329987c85f2494512
Signed-off-by: Joey Boggs <jboggs@redhat.com>