This PS enables the following backends for glance:
* PVC
* RBD
* RadosGW (direct)
* Swift
It also moves the creation of the RBD pool when required to a storage
init job. This job also creates credentials as required for glance to
use when accessing the required backend, rather than using the admin
keyring.
Change-Id: I90fead961ff73a9263826acc794128fa73ead2e1
b3f8b812ca