Initial qpid development work

* Switch base tower devel image from u14.04 to c7
* Switch container image to build python dependencies into itself
  instead of forcing it to be built on startup
* Upgrade venv pip to 8.1.2
* Neuter queue.py which was heavily tied to redis and was basically
  orphaned code
* Alter local_settings to override default cache settings and use
  memcached
* Alter local settings to refer to qpid instead of redis for celery
  broker
* Purge redis python dependencies and add qpid and memcached
* Update docker-compose to purge redis and add qpid and memcached

tools/docker-compose/awx-manage

@@ -1,4 +1,4 @@
-#!/tower_devel/venv/tower/bin/python
+#!/venv/tower/bin/python
 # EASY-INSTALL-ENTRY-SCRIPT: 'ansible-tower==3.0.0-0.devel','console_scripts','awx-manage'
 __requires__ = 'ansible-tower==3.0.0-0.devel'
 import sys