Charmhelpers is now installed via pip for unit tests so stop
'Make sync' from pulling it down.

Change-Id: I605e431fea9d57eac431a83c3347058c73384710

Change-Id: I02dd12ae127870747175237d9b7c998e0c2ac0cd

Switch to using bundletester for execution of functional tests,
leveraging tox to build out test virtualenvs.

Rename amulet tests inline with gate-*, dev-* and dfs-*
naming standards.

Update README to refer to functional testing section of the charm
guide.

Change-Id: Id617a634f7d12e8acab07ee121f9fd38b8380c17

Adds improved pause and resume unit to the charm such tha the
charm stays paused during maintenance operations.  Updates the
basic_deployment.py to use the the new version of
python-ceilometerclient (that's available in xenial, but works
back to icehouse/precise.

Change-Id: I869e467d0e4d9fecd661a6f946d45e31535ea11e

Modify the Makefile to point at the appropriate tox targets
so that tox and Make output can be equivalent. This involves
mapping the lint target to the pep8 target and the test target
to the py27 target.

Change-Id: I47859e9b828a007eb3496cc6f0cfabef3e6add2c

Amulet tests - add subordinate relation, service catalog, endpoint and nova ceilometer config checks.

auto Makefile test target (amulet):  bump juju test timeout to 2700s (same value as the juju-deployer default).  Also remove explicit test names, which will cause all +x files in ./tests to be executed (as bundletester does by default).