Fix json2tango return value

.gitlab-ci.yml

@@ -46,7 +46,7 @@ configure_job:
     - sleep 10
     - /usr/local/bin/DataBaseds 2 -ORBendPoint giop:tcp::10000 &
     - sleep 10
-    - exit_code=0
+    - exit_code=2
     - json2tango -w -a -u ./test/ah_config.json || $exit_code=$?
     # json2tango returns 2 if values written to DB
     - if [ ${exit_code} -ne 2 ]; then echo "It failed!" ; else echo "It worked!"; fi