Create transform to query the status of a Hop Server

This would make it easy to query the status of a Hop Server.

I have no idea why it's not in Hop already since it's on the imported source code list.  Probably an oversight.

https://github.com/mattcasters/kettle-needful-things/tree/master/src/main/java/org/pentaho/di/needful/steps/slavestatus

It's probably better to re-write this because of the many API changes in Hop.