When syncing hostname and physical networks, filter neutron
hosts on agent_type. Only segmenthostmappings for hosts
with agent 'OVN Controller agent' should be cleaned up.
Since change: I935186b6ee95f0cae8dc05869d9742c8fb3353c3 there
is de-duplication of segmenthostmapping updates from agents.
If the OVN DB sync clears/deletes mappings for hosts owned by
other agents/plugins the mappings are never re-created.
Closes-Bug: #2040172
Change-Id: Iaf15e560e1b1ec31618b2ebc6206a938463c1094
Signed-off-by: Harald Jensås <hjensas@redhat.com>
3aafeefc85