sos: Add ovn_central and ovn_host plugin
sos: Add ovn_central and ovn_host plugin

ovn_central and ovn_host provides useful insights about the OVN. Collect
ovn_central from engine and ovn_host from hosts.

Change-Id: I96423bbeb01cabba595536633ea145c218fe4110
Signed-off-by: Nijin Ashok <4cf330ce0daa001637ef6aad9237485745da0d29@redhat.com>

oVirt/ovirt-log-collector,oVirt/ovirt-log-collector,oVirt/ovirt-log-collector