Stop using deprecated keystoneclient function
Stop using deprecated keystoneclient function

Using keystoneclient.Client.request is deprecated so keystone tests
shouldn't use it.

Change-Id: Iece9f2346f7e3a94c78bcdeeb062ace56d9c570d

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