All contributors to this charm have agreed to the switch
from GPL v3 to Apache 2.0; switch to Apache-2.0 license
as agreed so we can move forward with official project status.

Change-Id: Iaee75f59fe51f01da18aa2703a46c3885ade73c0

The existing pause/resume functionality is enhanced with
changed charm-helpers support to chech that the services
really are stopped and that paused units really stay
paused.  The restart_on_change decorator is gated
such that if the unit is 'paused' then the service
is not accidentally started.

Change-Id: Ie0c5e0249bde0839345ad66f7400522754aa91ca

Implemented new is_paused() and assess_status() functions, and changed
the pause and resume actions to use them. Changed existing and added new
tests to verify functionality.

Change format of openstack-origin-yaml, use try/except in action, use git_src_dir in post install, update amulet tests.