Use host switch to get overlay transport zone from 3.0.0.
Get from tn['host_switch_spec']['host_switches'][0]
['transport_zone_endpoints'] since 3.0.0.
Get from tn['transport_zone_endpoints'] before 3.0.0.
Change-Id: I26b5756fe28fcaff7541002623dc982eb2dbee70
When finding the overlay transport zone of a tier0 router,
if its advanced_config already has transport_zone_id defined,
then return it directly. Otherwise search through the edge nodes
in the corresponding edge_cluster.
Change-Id: Idf1efd9d0cd2c2ef5af895d22fc156630d855488
Added support to create centralized service port to attach Tier1
router to Logical Switch
Added support to get centralized service port for a given Tier1
router
Change-Id: I4e017b8e11c5fd6bfcd689238e0f71ebd29c379e
Add return value to add_router_link_port method then an API call could
be saved if client code needs the ports.
Change-Id: I5cc2f33be75888e014fda9aad3f4e0c80674ea27
