Add test_create_is_domain_project
Add test_create_is_domain_project

With the Reseller feature it is possible to create domains
via the project API (since domains now are just a special
type of project). This patch adds a test that creates a
domain via the project API and verifies that it is also
possible to list such project using the domain API.

Change-Id: I3dc33521733efd97bda68acd2a318a94710f236c

masayukig/tempest,cisco-openstack/tempest,vedujoshi/tempest,cisco-openstack/tempest,vedujoshi/tempest,openstack/tempest,Juniper/tempest,masayukig/tempest,Juniper/tempest,openstack/tempest