Minor fix for tapi helper and for TAPI Rpc error message

Change-Id: Ieef1c0937f797efc26a00d9e9e67850cb92f6919
diff --git a/apps/odtn/api/src/test/resources/openconfig-device-link.json b/apps/odtn/api/src/test/resources/openconfig-device-link.json
index 9cbc0e3..23bbf67 100644
--- a/apps/odtn/api/src/test/resources/openconfig-device-link.json
+++ b/apps/odtn/api/src/test/resources/openconfig-device-link.json
@@ -4,42 +4,48 @@
       "basic": {
         "type": "OPTICAL",
         "metric": 1,
-        "durable": true
+        "durable": true,
+        "bidirectional": true
       }
     },
     "netconf:127.0.0.1:11002/202-netconf:127.0.0.1:11003/202": {
       "basic": {
         "type": "OPTICAL",
         "metric": 1,
-        "durable": true
+        "durable": true,
+        "bidirectional": true
       }
     },
     "netconf:127.0.0.1:11002/203-netconf:127.0.0.1:11003/203": {
       "basic": {
         "type": "OPTICAL",
         "metric": 1,
-        "durable": true
+        "durable": true,
+        "bidirectional": true
       }
     },
     "netconf:127.0.0.1:11002/204-netconf:127.0.0.1:11003/204": {
       "basic": {
         "type": "OPTICAL",
         "metric": 1,
-        "durable": true
+        "durable": true,
+        "bidirectional": true
       }
     },
     "netconf:127.0.0.1:11002/205-netconf:127.0.0.1:11003/205": {
       "basic": {
         "type": "OPTICAL",
         "metric": 1,
-        "durable": true
+        "durable": true,
+        "bidirectional": true
       }
     },
     "netconf:127.0.0.1:11002/206-netconf:127.0.0.1:11003/206": {
       "basic": {
         "type": "OPTICAL",
         "metric": 1,
-        "durable": true
+        "durable": true,
+        "bidirectional": true
       }
     }
   }