Migration to new event defination for OpenONU adapter

     This change is for the migration of alarms and KPIs for earlier
     separate defination of AlarmEvent and KPIEvent to a generic format
     called Event where it could be an alarm or a KPI event

     An event manager adapter_events handles the event submission.

Change-Id: If088a1876fbbae2975ef77c4364dd96bbe361c8d
diff --git a/python/requirements.txt b/python/requirements.txt
index b264018..365d76f 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -60,4 +60,4 @@
 python-consul==0.6.2
 afkak==3.0.0.dev20181106
 voltha-protos>=0.1.4
-pyvoltha==0.2.4
+pyvoltha==2.2.0