Store project_domain in project_domain_id
Store project_domain in project_domain_id

The same way that context was changed to store the attribute in
user_domain_id, use project_domain_id to remove some errors.

Change-Id: I591b6644e113cc90eeb2aff6b628a649ae8d4740
Related-Bug: #1663013

openstack/heat,openstack/heat,noironetworks/heat,noironetworks/heat