rename cls in get_auth_context to self
rename cls in get_auth_context to self

Authough it is not required, but we use self for member method and
cls for class method generally.

Change-Id: I774460a9e802e873c93e0eb07ab454af0d4dd4df

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