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/main/queue.py

@@ -3,43 +3,11 @@
 
 import json
 
-from redis import StrictRedis
-
 from django.conf import settings
 
 __all__ = ['FifoQueue']
 
-
-# Determine, based on settings.BROKER_URL (for celery), what the correct Redis
-# connection settings are.
-redis_kwargs = {}
-broker_url = settings.BROKER_URL
-if not broker_url.lower().startswith('redis://'):
-    raise RuntimeError('Error importing awx.main.queue: Cannot use queue with '
-                       'a non-Redis broker configured for celery.\n'
-                       'Broker is set to: %s' % broker_url)
-broker_url = broker_url[8:]
-
-# There may or may not be a password; address both situations by checking
-# for an "@" in the broker URL.
-if '@' in broker_url:
-    broker_auth, broker_host = broker_url.split('@')
-    redis_kwargs['password'] = broker_auth.split(':')[1]
-else:
-    broker_host = broker_url
-
-# Ignore anything after a / in the broker host.
-broker_host = broker_host.split('/')[0]
-
-# If a custom port is present, parse it out.
-if ':' in broker_host:
-    broker_host, broker_port = broker_host.split(':')
-    redis_kwargs['port'] = int(broker_port)
-
-# Now create a StrictRedis object that knows how to connect appropriately.
-redis = StrictRedis(broker_host, **redis_kwargs)
-
-
+# TODO: Figure out wtf to do with this class
 class FifoQueue(object):
     """An abstraction class implemented for a simple push/pull queue.
 
@@ -54,14 +22,16 @@ class FifoQueue(object):
 
     def __len__(self):
         """Return the length of the Redis list."""
-        return redis.llen(self._queue_name)
+        #return redis.llen(self._queue_name)
+        return 0
         
     def push(self, value):
         """Push a value onto the right side of the queue."""
-        redis.rpush(self._queue_name, json.dumps(value))
+        #redis.rpush(self._queue_name, json.dumps(value))
 
     def pop(self):
         """Retrieve a value from the left side of the queue."""
-        answer = redis.lpop(self._queue_name)
+        #answer = redis.lpop(self._queue_name)
+        answer = None
         if answer:
             return json.loads(answer)