Upgrade to Hibernate Search 5.8.0.Final

This upgrade should be straight forward as we've been tracking changes across both repositories.

The one complexity which wasn't tested yet is that the modules released by Hibernate Search are now aiming for WildFly 11 as primary targed. I see no reason for them not to work on WildFly 10 though.

N.B. Hibernate ORM also released modules compatible with WildFly 11; in that case those modules are not going to work on WildFly 10, so I'm intentionally not following up with an update of the Hibernate ORM component.