Merge branch 'add_webmail_subdomain' into 'master'

add webmail subdomain

See merge request andrijoos/kubernetes-templates!19

deploy/external.json

@@ -85,6 +85,9 @@
         },
         "chat.joos.to": {
             "endpoint": "external-joos-to"
+        },
+        "webmail.joos.to": {
+            "endpoint": "external-joos-to"
         }
     }    
 }