Add calamari_nosetests task.

Includes all accumulated review commentary and final 'yum clean all' fix.

Signed-off-by: Dan Mick <dan.mick@redhat.com>
Add calamari suite definitions.

Notes:
- very simple cluster configuration
- selects vps in the actual suite config files
- wheezy is currently disabled

Signed-off-by: Dan Mick <dan.mick@inktank.com>