Remove optional usage of Attach API

This is a request to remove our optional usage of Attach API.

Users keep running into issues caused by GFSH using the Attach API. If the user kills a GemFire process that was started by GFSH, the Attach API leaves a java_pid file in /tmp which prevents the Attach API from working with any future JVMs that reuse that pid. Most users also want to use a JRE without the tools.jar.

The only functionality that will be removed is status and stop command support for --pid option.