Restore support for configuring surefire forkedProcessTimeoutInSeconds, or clean out docs and cruft

The "WildFly Integration Testsuite User Guide" doc includes mention of setting property surefire.forked.process.timeout to control the surefire forkedProcessTimeoutInSeconds setting. And there are a couple places in the poms where this property is set. But nowhere is the property used to configure surefire.

So we should either change the docs to remove this bit of doc and clean out the cruft in our poms, or we should restore the functionality.

I'm sending up a PR to do the latter, as that will align with what's done in the EAP branch. Right now I figure it's simpler to align, e.g. in case someone in QE uses this property. We can always revisit and remove it later if there's no valid use.