Copy over the modules and tests to flocker.common prior to deleting volume specific code
Remove volume specific tests and apis
Remove common ipc tests and code from flocker.volume
Update some remaining ipc imports
Merge remote-tracking branch 'origin/master' into common-inode-287
Remove common ipc tests from the volume ipcs functional test module
Merge pull request #299 from ClusterHQ/common-inode-287

Move common ProcessNode code to flocker.common

Author: @wallrj
Reviewer: @itamarst 

Fixes #287