VOL-1437 : Fix display of devices in CLI

Renamed state field in image download proto which caused
json marshalling to fail.

other updates
- unmarshal data properly when pulling data from kv in watch
- do not update unecessarily if watch data matches data in memory
- added ofagent target to python Makefile
- fixed grpc path to update log level which interfered with getdevice

Change-Id: I4fceeb539c3325b6754efe2b68251d83b7367211
diff --git a/db/model/persisted_revision.go b/db/model/persisted_revision.go
index 84b9569..98e80e4 100644
--- a/db/model/persisted_revision.go
+++ b/db/model/persisted_revision.go
@@ -131,7 +131,13 @@
 				if dataPair, err := pr.kvStore.Get(pr.GetHash()); err != nil || dataPair == nil {
 					log.Errorw("update-in-memory--key-retrieval-failed", log.Fields{"key": pr.GetHash(), "error": err})
 				} else {
-					pr.UpdateData(dataPair.Value, pr.GetBranch())
+					data := reflect.New(reflect.TypeOf(pr.GetData()).Elem())
+
+					if err := proto.Unmarshal(dataPair.Value.([]byte), data.Interface().(proto.Message)); err != nil {
+						log.Errorw("update-in-memory--unmarshal-failed", log.Fields{"key": pr.GetHash(), "error": err})
+					} else {
+						pr.UpdateData(data.Interface(), pr.GetBranch())
+					}
 				}
 
 			default: