VOL-3504 Change in Protos to support force delete device

Change-Id: I89feea5fa74e755d032c330fa51d540726e4db10
diff --git a/protos/voltha_protos/common.proto b/protos/voltha_protos/common.proto
index 91e1fb1..09f42fc 100644
--- a/protos/voltha_protos/common.proto
+++ b/protos/voltha_protos/common.proto
@@ -42,6 +42,9 @@
 
         // The device is marked to be deleted
         DELETED = 5;
+
+        // The device is marked to be in deleting state
+        DELETING = 6;
     }
 }