Resolve #217 by using VertxInternal.addCloseHook

[Yaytay]

Motivation:

It doesn't make sense to keep trying to reconnect when vertx has shut down.

Conformance:

Your commits should be signed and you should have signed the Eclipse Contributor Agreement as explained in https://github.com/eclipse/vert.x/blob/master/CONTRIBUTING.md Please also make sure you adhere to the code style guidelines: https://github.com/vert-x3/wiki/wiki/Vert.x-code-style-guidelines