Support multiple stores of Glance
Support multiple stores of Glance

Co-authored-by: Abhishek Kekane <akekane@redhat.com>
Co-authored-by: Brian Rosmaita <rosmaita.fossdev@gmail.com>

Change-Id: Ia02a64f522a62ccfcdbf87b6b2fa8cb205faf131
bp:support-glance-multiple-backend

openstack/cinder-specs