Set the availability zone if it was configured
Fix description of rbd_user parameter

This is more understandable.
Merge pull request #136 from dirkmueller/rados_naming

Fix description of rbd_user parameter
Merge pull request #135 from dirkmueller/release/roxy/master

Rediscover VGs after boot in file backend case
Fix crash with boot.looplvm service not being defined

It cannot be defined in an optional path and referenced in the
notification of a non-optional resource.
Merge pull request #137 from vuntz/fix-crash

Fix crash with boot.looplvm service not being defined
Merge pull request #124 from vuntz/az

Set the availability zone if it was configured
Configure lock_path / keystone_signing_dir in Cinder

Otherwise a random directory in /tmp is chosen, which
doesn't work for our multi-process setup