[merge] Merge relation-get-args branch. [r=niemeyer] [f=719329]
* relation-get now follows the specification for argument ordering.
The documented format is:
relation-get [setting_name] [unitname]
'-' may be used for setting_name to indicate ALL relation settings.
unitname may be ommited and now defaults to the remote unit of the relationship.
* many cleanups to the tests and removal of many testing hook files from the tree