SEBA-907 handling DeleteOnu and Fix for SEBA-920

Change-Id: I0691fc273667675314a347061d59c8058fb682c9
diff --git a/api/bbsim/bbsim.yaml b/api/bbsim/bbsim.yaml
index 484ad3c..edb78bd 100644
--- a/api/bbsim/bbsim.yaml
+++ b/api/bbsim/bbsim.yaml
@@ -27,4 +27,7 @@
     get: "/v1/olt/onus"
   - selector: bbsim.BBSim.GetONU
     get: "/v1/olt/onus/{SerialNumber}"
-
+  - selector: bbsim.BBSim.ShutdownONU
+    delete: "/v1/olt/onus/{SerialNumber}"
+  - selector: bbsim.BBSim.PoweronONU
+    post: "/v1/olt/onus/{SerialNumber}"