Add ovs-record-hostname to the list of deferrable services, this service
was SRU'ed into Ubuntu >= Focal, when it's not mark as deferrable on
package upgrades will induce a restart of openvswitch-switch.
Change-Id: I4fa3256b39e62e9df223ab40f17f1677a621f293
Closes-Bug: #1923636
Related-Bug: #1915829