Add event network update vm interface for rhev/ovirt post provision functions

A RHEV/OVIRT+MIQ environment where ip addresses are picked up after a new vm is created the rhev/ovirt manager will emit the event 'NETWORK_UPDATE_VM_INTERFACE' on first boot. Any post-provisioning activity dependent on that ip address existing in the VMDB will fail unless a full provider refresh were to happen.  Adding the NETWORK_UPDATE_VM_INTERFACE event to force a refresh of the provider. 


https://bugzilla.redhat.com/show_bug.cgi?id=1097393