See https://github.com/jenkinsci/remoting/pull/78

I had to disable annotation scanning or else it adds too much overhead
to the startup time.

* the transitive Groovy dependencies jline and jansi had to be updated
* use gmaven-runtime-2.0

This way, the inner-working of the protocol can be kept private within
the remoting module, which increases a modularity.

As part of the process of getting a [new plugin parent POM](https://github.com/jenkinsci/plugin-pom) decouple from the core project
the plugin module is removed.