All OpenStack charms are now directly published to the charm store
on landing; switch Amulet helper to resolve charms using the
charm store rather than bzr branches, removing the lag between
charm changes landing and being available for other charms to
use for testing.
This is also important for new layered charms where the charm must
be build and published prior to being consumable.
Change-Id: I1e300c5f6ad9f443203504ea9f95e35b49fbde19
3864f04687