Removes py3 test import hacks
Removes py3 test import hacks

Now that everything Keystone depends on can be installed on Python 3
there is no reason why we need to have these hacks anymore. 

Change-Id: I44d02fcac74eca5d282025b90693c2dae5a582b2

dims/keystone,klmitch/keystone,openstack/keystone,maestro-hybrid-cloud/keystone,himanshu-setia/keystone,openstack/keystone,takeshineshiro/keystone,openstack/keystone,ilay09/keystone,mahak/keystone,mahak/keystone,mahak/keystone,roopali8/keystone,takeshineshiro/keystone,klmitch/keystone,idjaw/keystone,idjaw/keystone,cernops/keystone,cernops/keystone,ajayaa/keystone,ilay09/keystone,ilay09/keystone,rajalokan/keystone,maestro-hybrid-cloud/keystone,rajalokan/keystone,ajayaa/keystone,himanshu-setia/keystone,rajalokan/keystone,roopali8/keystone,dims/keystone