Adding service to expose the DMI server port

Change-Id: If723340251e26c55325f90853d4f0b1d7f375d22
diff --git a/bbsim/templates/service.yaml b/bbsim/templates/service.yaml
index b643065..8b19af6 100644
--- a/bbsim/templates/service.yaml
+++ b/bbsim/templates/service.yaml
@@ -39,6 +39,9 @@
     - name: "bbsim-{{ .Values.olt_id }}-rest"
       port: {{ .Values.bbsim_rest_port }}
       protocol: TCP
+    - name: "bbsim-{{ .Values.olt_id }}-dmi"
+      port: {{ .Values.bbsim_dmi_port }}
+      protocol: TCP
   selector:
     app: "bbsim"
     name: {{ template "bbsim.name" . }}