Using gfsh to shutdown a server can result in an unclean shutdown under certain circumstances

Occasionally, when the dev REST API is enabled, and gfsh is used to shutdown a server, the server does not shutdown cleanly and exits early.

This can be seen even more frequently (almost 100%) when the system property gemfire.disableShutdownHook is set.

This may not appear as a problem in most cases, however if network-partition-detection is enabled then other members will see this as a member crashing and may disconnect themselves from the cluster in order to avoid a split brain.