VertxPullInDepsMojo if not event.succeeded() it should cause build to fail, not just be logged

how about this?

The other Mojo's have the same problem BTW - consider changing them accordingly, or better something in BaseVertxMojo to handle failure? Want another PR?

PS: Re. Eclipse CLA, I'm an Eclipse commiter, so you're cool. Let me know if you need.. some ID (what?).