[OVN] MetadataProxyHandler to conditionally monitor both Chassis's tables
[OVN] MetadataProxyHandler to conditionally monitor both Chassis's tables

If both Chassis and Chassis_Private tables are passed to the
MetadataProxyHandler class we should conditionally monitor both of them.

Change-Id: Iffd1deb977e92b9a600ab2603408ddf2eb387e18
Co-Authored-By: Terry Wilson <0ef9166ffb07b98b817ea7d6bbe447ae88189dfd@redhat.com>
Closes-Bug: #1925836
Signed-off-by: Lucas Alvares Gomes <ef89b923b1145c9ec2fd96eee513279016a7a963@gmail.com>

openstack/neutron,mahak/neutron,mahak/neutron,openstack/neutron,mahak/neutron,openstack/neutron