Fix integration tests

[ppazos]

There is a problem with grails test-app -integration

The XmlService has scope = request and can't be included in a singleton one that is the SyncService

Check https://stackoverflow.com/questions/14550450/grails-scoped-service-in-integration-test

One solution would be to remove the error reporting field from the service and make it singleton

Also check if travis can work after the fix:

• https://stackoverflow.com/questions/34109659/grails-command-not-found-with-travis-ci
• https://guides.grails.org/grails-on-travis-basics/guide/index.html