restapi: Replace JAXB version provided by JBoss

The version of the JAXB implementation provided by the application
server is 2.2.4, and it contains a bug that can cause a NPE:

  https://java.net/jira/browse/JAXB-860

Luckily this bug isn't currently triggered by the engine, but it will be
once the following patch is merged:

  http://gerrit.ovirt.org/30189

To avoid this issue this patch upgrades the version used by the engine
and adds a module that replaces the one provided by the application
server with a newer version of JAXB that isn't affected by the bug.

Change-Id: I3780ed6f54316482eb5e4cb77fd58b3ec2f59847
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>