setup playbook and heartbeat for isolated deployments

* Allow isolated_group_ use in setup playbook
* Tweaks to host/queue registration commands complementing setup
* Create isolated heartbeat task and check capacity
* Add content about isolated instances to acceptance docs

awx/settings/development.py

@@ -114,6 +114,13 @@ except ImportError:
 
 CLUSTER_HOST_ID = socket.gethostname()
 CELERY_ROUTES['awx.main.tasks.cluster_node_heartbeat'] = {'queue': CLUSTER_HOST_ID, 'routing_key': CLUSTER_HOST_ID}
+# Production only runs this schedule on controlling nodes
+# but development will just run it on all nodes
+CELERYBEAT_SCHEDULE['isolated_heartbeat'] = {
+    'task': 'awx.main.tasks.tower_isolated_heartbeat',
+    'schedule': timedelta(seconds = AWX_ISOLATED_PERIODIC_CHECK),
+    'options': {'expires': AWX_ISOLATED_PERIODIC_CHECK * 2,}
+}
 
 # Supervisor service name dictionary used for programatic restart
 SERVICE_NAME_DICT = {