Offline CLI for a Host Controller

Direct local administration of a Host Controller running from a WildFly Core-based installation via the CLI without requiring a socket-based connection. The general use case is initial setup type activities where the user doesn't want to have to launch a WF server or HC process and potentially have it be visible on the network. WFLY-3288 is one use case; another is a desire some folks have expressed in being able to do configuration without first having to edit any xml to avoid port conflicts on 9990 or 9999.

As the CLI is itself embeddable, this also opens up the possibility of embedding the CLI inside some other process (say a test class, a provisioning tool or a jar with a main) and then launching the embedded server and using the embedded CLI as a convenient management tool.

This JIRA is for administering a Host Controller. A separate JIRA, WFCORE-584 is for equivalent functionality for a standalone server.

This will require some rework of the Host Controller / Process Controller relationship, as embedding a PC in the CLI makes no sense. The server-lifecycle control functions of the PC will need to be moved into the same process.