ovn: Consider all router ports in is_lsp_router_port()
ovn: Consider all router ports in is_lsp_router_port()

The function considered only device owners known to OVN. On migrated
environments the device owner could be different. The codebase contains
a constant tuple containing all router port device owners. This patch
uses the constant instead.

Change-Id: I026ac8ea9c35a425470a2eaede35b3bfeba259c3
Closes-bug: #1941902
Signed-off-by: Jakub Libosvar <d2de8475ecde4f30221bae835ec23b041ec4f992@redhat.com>

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