Removes the use of mutables as default args
Removes the use of mutables as default args

Automatic enforcement of this rule is added in:
https://review.openstack.org/78119

bp more-code-style-automation

Change-Id: I184105a456e9beae3cb3d6716b974ba52ef8bdad

rushiagr/keystone,reeshupatel/demo,rushiagr/keystone,vivekdhayaal/keystone,promptworks/keystone,rajalokan/keystone,jonnary/keystone,mahak/keystone,rajalokan/keystone,nuxeh/keystone,ilay09/keystone,ilay09/keystone,roopali8/keystone,openstack/keystone,jamielennox/keystone,roopali8/keystone,jamielennox/keystone,mahak/keystone,blueboxgroup/keystone,ging/keystone,dstanek/keystone,dstanek/keystone,rodrigods/keystone,himanshu-setia/keystone,jumpstarter-io/keystone,reeshupatel/demo,promptworks/keystone,blueboxgroup/keystone,vivekdhayaal/keystone,promptworks/keystone,ajayaa/keystone,dstanek/keystone,dims/keystone,UTSA-ICS/keystone-kerberos,idjaw/keystone,idjaw/keystone,rajalokan/keystone,nuxeh/keystone,klmitch/keystone,UTSA-ICS/keystone-kerberos,rodrigods/keystone,mahak/keystone,takeshineshiro/keystone,jumpstarter-io/keystone,takeshineshiro/keystone,klmitch/keystone,maestro-hybrid-cloud/keystone,ajayaa/keystone,openstack/keystone,openstack/keystone,rushiagr/keystone,MaheshIBM/keystone,jumpstarter-io/keystone,maestro-hybrid-cloud/keystone,reeshupatel/demo,cernops/keystone,ging/keystone,ilay09/keystone,dims/keystone,MaheshIBM/keystone,himanshu-setia/keystone,nuxeh/keystone,vivekdhayaal/keystone,jonnary/keystone,cernops/keystone