Allow adding external interfaces to an OVN network #2785

Job	Run time
Documentation	1m 10s
Client (oldstable, ubuntu-latest)	56s
System (stable, cluster, dir)	1m 3s
Code (oldstable)	1m 9s
Client (oldstable, macos-latest)	52s
Code (stable)	57s
System (stable, cluster, btrfs)	1m 4s
Client (oldstable, windows-latest)	56s
Code (tip)	1m 7s
System (stable, cluster, lvm)	1m 5s
Client (stable, ubuntu-latest)	1m 7s
System (stable, cluster, zfs)	1m 4s
Client (stable, macos-latest)	57s
System (stable, cluster, ceph)	1m 3s
Client (stable, windows-latest)	55s
System (stable, cluster, random)	1m 8s
System (stable, standalone, dir)	1m 8s
System (stable, standalone, btrfs)	1m 6s
System (stable, standalone, lvm)	1m 7s
System (stable, standalone, zfs)	1m 8s
System (stable, standalone, ceph)	1m 4s
System (stable, standalone, random)	1m 7s
System (oldstable, cluster, dir)	1m 6s
System (oldstable, standalone, dir)	1m 2s
System (tip, cluster, dir)	1m 7s
System (tip, standalone, dir)	1m 5s
	27m 33s

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