mailman: adjust some settings to try and avoid OOM

Set django to have 4 workers and have a retry longer than the timeout.
Disable local memcached and use the memcached01 instance.
Enabled debug logging on gunicorn to see what it's doing.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/mailman3/templates/settings.py.j2

@@ -311,6 +311,8 @@ HAYSTACK_CONNECTIONS = {
 #
 Q_CLUSTER = {
     'timeout': 300,
+    'retry': 600,
+    'workers': 4,
     'save_limit': 100000,
     'orm': 'default',
 }
@@ -383,11 +385,11 @@ LOGGING = {
 }
 
 
-# Cache: use the local memcached server
+# Cache: use the remote memcached server
 CACHES = {
     'default': {
         'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
-        'LOCATION': '127.0.0.1:11211',
+        'LOCATION': 'memcached01:11211',
     }
 }