CORD-898: Limit list of categories until we see the need to add more

Change-Id: I24a7e4f7e2956164012cbfa646e554bc38b94661
diff --git a/voltha/core/adapter_agent.py b/voltha/core/adapter_agent.py
index edcf236..e7a26f8 100644
--- a/voltha/core/adapter_agent.py
+++ b/voltha/core/adapter_agent.py
@@ -326,7 +326,7 @@
     def create_alarm(self, id=None, resource_id=None, description=None,
                      raised_ts=0, changed_ts=0,
                      type=AlarmEventType.EQUIPMENT,
-                     category=AlarmEventCategory.GENERAL,
+                     category=AlarmEventCategory.PON,
                      severity=AlarmEventSeverity.MINOR,
                      state=AlarmEventState.RAISED,
                      context=None):