Report single node clusters as non-ha (#11212)

* Report single node clusters as non-ha

* Move test file so we can make it use the database

* Update unit test to accomidate different node types

awx/main/ha.py

@@ -10,6 +10,6 @@ def is_ha_environment():
     otherwise.
     """
     # If there are two or more instances, then we are in an HA environment.
-    if Instance.objects.count() > 1:
+    if Instance.objects.filter(node_type__in=('control', 'hybrid')).count() > 1:
         return True
     return False