Update glance-store to python-glance-store-0.28.0-2.el7
Update glance-store to python-glance-store-0.28.0-2.el7

It includes a patch required to work with Ceph Nautilus RadosGW as swift
backend.

Change-Id: I2fee5ca142640fb7ee7b0ac9c86fd67059bce744

redhat-openstack/rdoinfo,javierpena/rdoinfo