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

awx/settings/local_settings.py.docker_compose

@@ -48,8 +48,23 @@ if is_testing(sys.argv):
     
     MONGO_DB = 'system_tracking_test'
 
+# Django Caching Configuration
+if is_testing():
+    CACHES = {
+        'default': {
+            'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+        },
+    }
+else:
+    CACHES = {
+        'default': {
+            'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
+            'LOCATION': 'memcached:11211',
+        },
+    }
+
 # Celery AMQP configuration.
-BROKER_URL = 'redis://redis/'
+BROKER_URL = 'qpid://qpid:5672'
 
 # Mongo host configuration
 MONGO_HOST = NotImplemented