Allow tenant name to be used in authentication
Allow tenant name to be used in authentication

Change-Id: If0bdf67143d64172db0b665fc07c165fabc9486a

varunarya10/python-glanceclient,mmasaki/python-glanceclient,JioCloud/python-glanceclient,alexpilotti/python-glanceclient,metacloud/python-glanceclient,ntt-sic/python-glanceclient,alexpilotti/python-glanceclient,JioCloud/python-glanceclient,varunarya10/python-glanceclient,klmitch/python-glanceclient,mmasaki/python-glanceclient,citrix-openstack-build/python-glanceclient,citrix-openstack-build/python-glanceclient,openstack/python-glanceclient,metacloud/python-glanceclient,klmitch/python-glanceclient,ntt-sic/python-glanceclient,openstack/python-glanceclient