Update Netty version to allow retries with TCP on timeout

[candicerimba]

There was a recent update to Netty that provides an option to retry with TCP upon timeouts. Could we update the Netty version (to v. 4.1.105) and also either expose this option, or set it to true by default (don't see why people may not want this)?

[vietj]

we already have the latest netty I think, however we have timeout built in vertx TCP client, perhaps we can use the new netty feature instead

[candicerimba]

That would be great! At the moment, we're having issues with a timeout issue that seems to stem from Netty, rather than Vertx so it'd need to be fixed on that dependency.