add a test that uses trusts and implies roles
add a test that uses trusts and implies roles

looks like implied roles are not expanded for tokens that were
created from trusts

Change-Id: I76b94faf094721c254caa6f9d7289d084c957d80
Closes-Bug: 1539240
Related-Bug: 1543318

mahak/keystone,ilay09/keystone,openstack/keystone,cernops/keystone,dims/keystone,openstack/keystone,klmitch/keystone,himanshu-setia/keystone,dims/keystone,rajalokan/keystone,himanshu-setia/keystone,klmitch/keystone,ilay09/keystone,mahak/keystone,cernops/keystone,mahak/keystone,rajalokan/keystone,ilay09/keystone,rajalokan/keystone,openstack/keystone