Volume instances are now created with a reference to their
VolumeService, and all unit tests now pass.
Try to fix the remaining issues caused by the API change.
Volume.locally_owned(), allowing checking a volume is local.
Merge remote-tracking branch 'refs/remotes/origin/master' into volume-ownership-584
Fix a few more places where _pool needed to be pool.
Address review comment: No need to duplicate documentation.
Merge pull request #590 from ClusterHQ/volume-ownership-584

Volume ownership check

Fixes #584.