AGPUSH-927: enforce Jackson1 as a JSON serialization provider for RestEasy

- makes WildFly 8.1 happy as it uses Jackson 2 provider by default
  https://community.jboss.org/wiki/WildFly810FinalReleaseNotes

- works on WildFly 8.0

- we use different jboss-deployment-structure.xml for AS7/EAP6

See details in https://issues.jboss.org/browse/AGPUSH-927