WIP: ovs: don't release slaves on quit

Beniamino Galvani requested to merge bg/ovs-restart-rh1733709 into master

An OVS bridge and its slaves can continue to work even after NM has quit. Keep the interface enslaved when the @configure argument of device->release_slave() is FALSE, which happens on quit and in other circumstances when we don't really want to release the slave from its master.


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