Default to using neutron networks_client in get_tenant_network

Proxy apis to neutron like '/os-networks' are deprecated in
microverion 2.36, and calling to them will get 404 error.
So this is to use neutron networks_client as default in get_tenant_network.

https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id33

Change-Id: I0496d2d0c3c9fe29d61124275c7f5cca78729bf2
5 files changed