Environment.admin_net2 was returned for compatibility

Environment.admin_net2 was returned for compatibility
with old tests

Change-Id: I2c155c63951bd266d3ea33020eaf49f2018ea550

devops/models/environment.py

@@ -52,6 +52,16 @@ def admin_net(self):
         warnings.warn(msg, DeprecationWarning)
         return 'admin'
 
+    @property
+    def admin_net2(self):
+        msg = (
+            'Environment.admin_net2 is deprecated. '
+            'Replace by string "admin2".'
+        )
+        logger.warning(msg)
+        warnings.warn(msg, DeprecationWarning)
+        return 'admin2'
+
     @property
     def nat_interface(self):
         msg = (