Tests consistently use auth_plugin_config_override
Tests consistently use auth_plugin_config_override

Override auth_plugin_config_override rather than calling it from
config_overrides in more places for consistency and
understandability.

Change-Id: I41f088389e7cf5eb6648d961d66b709d9292ff67

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