Remove temporary local HasProject
Remove temporary local HasProject

Now that the tenant_id rename has merged in Neutron we can
remove the temporary work-around.

Also switch from the deprecated models_v2.HasId to the relocated
model_base.HasId

Related Blueprint: keystone-v3

Change-Id: I6e480be8f3fb725b9ff74309288f9c7faef84b68

openstack/networking-l2gw,openstack/networking-l2gw