TEST/MINOR: runtime_server: fix read only fields

Author: mjuraga

e2e/tests/servers/data/transient.json

@@ -1,8 +1,4 @@
 {
-  "address": "127.0.0.5",
   "admin_state": "ready",
-  "operational_state": "up",
-  "port": 80,
-  "server_id": 1,
-  "server_name": "server_01"
+  "operational_state": "up"
 }