Integrate memcached support for some host fields

Conflicts:
	setup/roles/packages_el/vars/default.yml
	setup/roles/packages_ubuntu/tasks/main.yml

awx/settings/defaults.py

@@ -223,6 +223,15 @@ EMAIL_HOST_USER = ''
 EMAIL_HOST_PASSWORD = ''
 EMAIL_USE_TLS = False
 
+# Memcached django cache configuration
+CACHES = {
+    'default': {
+        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
+        'LOCATION': '127.0.0.1:11211',
+        'TIMEOUT': 864000,
+    }
+}
+
 # Use Django-Debug-Toolbar if installed.
 try:
     import debug_toolbar