Add http as allowed store when glance configured to use rbd
Add http as allowed store when glance configured to use rbd

Adds http as an allowed store when glance is configured to use
ceph/rbd as the image store. The default configuration for
glance with lvm uses http as a secondary store. http store
is commonly used with automation tools like heat to pull
images into glance from endpoints. Without specifying http
as a store the expected default behavior fails. This patch
restores that default behavior.

Change-Id: Id3663123b8d54e53bd1fd130b65fd8383c9f35c0
Closes-Bug: #1631637

nihilifer/kolla,mrangana/kolla,stackforge/kolla,dardelean/kolla-ansible,coolsvap/kolla,rahulunair/kolla,dardelean/kolla-ansible,nihilifer/kolla,stackforge/kolla,coolsvap/kolla,intel-onp/kolla,stackforge/kolla,GalenMa/kolla,openstack/kolla,intel-onp/kolla,openstack/kolla,coolsvap/kolla,dardelean/kolla-ansible,GalenMa/kolla,mrangana/kolla,rahulunair/kolla