[WFCORE-293] : Add EAP 6.2 and 6.3 to versions tested in core-model-test.

Updating wildfly-legacy-test version.
Updating transformers for new versions.

Jira: https://issues.jboss.org/browse/WFCORE-293
PR needed before https://github.com/wildfly/wildfly-legacy-test/pull/2