Sketch of implementation.
Merge branch 'ipc-stdout-222' into volume-handoff-17
Outline of necessary tests.
API tweaks.
Implement first test.
Tests and implementation for VolumeService.acquire().
Snapshot pending refactoring branch.
Revert back to way it was before.
Merge remote-tracking branch 'refs/remotes/origin/master' into volume-handoff-17
Remove expose/unexpose logic, which will instead be handled at a higher
level by the orchestration code.
A sketch of an ugly design.
Merge branch 'high-level-ipc-238' into volume-handoff-17
Start moving acquire() into the IPC layer.
Implement RemoteVolumeManager.acquire() -- the script-side part is still
missing though.
`flocker-volume acquire` implementation.
acquire() returns a Deferred.
merge master
start
Fix some incorrect test setup.
Let main run - threads and so forth :/ - and the test passes yay.

Still need to deal with concurrency though.  Serial execution is not sufficient.