CLI JVM specific commands should start with a jvm prefix

[tzach]

Although the name suggest general OS info, the following commands return JVM specific info: thread, system [freemem, totalmem, gc] This commands should be moved under a jvm prefix. Similar commands for thread and system are require for the OS level, and can replace them at the cli root (no prefix).

[tzach]

In particular

[/]% top - present ALL system threads (not just jvm)

[/]% jvm top - jvm thread

[tzach]

validated