Currently openvswitch sets system-id based on inventory_hostname, but when
Ansible inventory contains ip addresses - then it will only take first ip
octet - resulting in multiple OVN chassis being named i.e. "10".
Then Neutron and OVN have problems functioning, because a chassis named "10"
will be created and deleted multiple times per second - this ends up in
ovsdb and neutron-server processes using up to 100% CPU.

Adding openvswitch role to ovn CI job triggers.

Change-Id: Id22eb3e74867230da02543abd93234a5fb12b31d
Closes-Bug: #1884734