This patch introduce new option GLANCE_RGW_BACKEND, if it set to true and radosgw enabled, glance is configured with swift backend options. Also create glance-swift user with ResellerAdmin role to interact with radosgw. CEPH_RGW_KEYSTONE_API_VERSION option was added to specify which keystone API versioni radosgw will use, default v2.0. Change-Id: I2cacf511e48720896aa621201d6188bd1d370b6e