Pin glance_store 2.6.0 to match upper constraints for related-bug
Pin glance_store 2.6.0 to match upper constraints for related-bug

The latest version causes problems with the glance component
scenario1 standalone per the related-bug.

Change-Id: I8efa315ed3569ee81fac3d79062f5c5c7f4c3f27
Related-Bug: https://bugs.launchpad.net/tripleo/+bug/1938558

redhat-openstack/rdoinfo