Add missing KernelAPIVersion for WildFly 14

When WFCORE-4109 and WFCORE-4137 have been done following the release of WildFly 14.0.0.Final, the KernelAPIVersion which is used by domain transformers has not been updated.

We need to add a value for WildFly 14.0.0.Final: VERSION_8_0(8, 0, 0)

In addition, KernelAPIVersion and HostExcludeResourceDefinition.KnownRelease should be tied together as both express model versions using ints which leads to inconsistencies such as highlighted by this issue.