This patch allows to check OVS patch port support using:
neutron-sanity-check --ovs_patch
or pass in the deployed configuration files with a non-empty
AGENT/tunnel_types (indeed patch ports are used to interconnect
br-int and br-tun):
neutron-sanity-check --config-file ml2.conf.ini
DocImpact
Related-Bug: #1285335
Change-Id: Ic7bfabd1f4b85bfa490dd06c70eb5682ee42a681