When DHCP agent is deployed with ml2/ovn for baremetal ports, ovn metadata route is not added. This patch adds route via ovn metadata port if exists so baremetal nodes can fetch metadata. Closes-Bug: #1982569 Related-Bug: https://bugzilla.redhat.com/show_bug.cgi?id=2213862 Change-Id: I12e496d70bb6db707b317d0aeb6e4edd6c43571e