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

Adding services for 7.4 and 7.3 aka EAP 6.3 and 6.2.
We need a release to update the version used in wildfly-core

Jira: https://issues.jboss.org/browse/WFCORE-293