add vbng_url to VBNGService model and admin
diff --git a/xos/cord/admin.py b/xos/cord/admin.py
index 6fc95e1..ec343de 100644
--- a/xos/cord/admin.py
+++ b/xos/cord/admin.py
@@ -194,15 +194,33 @@
 # vBNG
 #-----------------------------------------------------------------------------
 
+class VBNGServiceForm(forms.ModelForm):
+    vbng_url = forms.CharField(required=False)
+
+    def __init__(self,*args,**kwargs):

+        super (VBNGServiceForm,self ).__init__(*args,**kwargs)

+        if self.instance:

+            self.fields['vbng_url'].initial = self.instance.vbng_url

+

+    def save(self, commit=True):

+        self.instance.vbng_url = self.cleaned_data.get("vbng_url")

+        return super(VBNGServiceForm, self).save(commit=commit)

+

+    class Meta:

+        model = VBNGService
+
 class VBNGServiceAdmin(ReadOnlyAwareAdmin):
     model = VBNGService
     verbose_name = "vBNG Service"
     verbose_name_plural = "vBNG Service"
     list_display = ("backend_status_icon", "name", "enabled")
     list_display_links = ('backend_status_icon', 'name', )
-    fieldsets = [(None, {'fields': ['backend_status_text', 'name','enabled','versionNumber', 'description', "view_url","icon_url" ], 'classes':['suit-tab suit-tab-general']})]
+    fieldsets = [(None, {'fields': ['backend_status_text', 'name','enabled','versionNumber', 'description', "view_url", "icon_url",
+                                    'vbng_url' ],
+                         'classes':['suit-tab suit-tab-general']})]
     readonly_fields = ('backend_status_text', )
     inlines = [SliceInline,ServiceAttrAsTabInline,ServicePrivilegeInline]
+    form = VBNGServiceForm
 
     extracontext_registered_admins = True
 
diff --git a/xos/cord/models.py b/xos/cord/models.py
index c7ff12e..7eb8289 100644
--- a/xos/cord/models.py
+++ b/xos/cord/models.py
@@ -786,11 +786,15 @@
 class VBNGService(Service):
     KIND = VBNG_KIND
 
+    simple_attributes = ( ("vbng_url", "http://10.0.3.136:8181/onos/virtualbng/"), )
+
     class Meta:
         app_label = "cord"
         verbose_name = "vBNG Service"
         proxy = True
 
+VBNGService.setup_simple_attributes()
+
 class VBNGTenant(Tenant):
     class Meta:
         proxy = True