Remove the dumpdev configuration dialog, merge it into the regular
services configuration and enable it by default. Committed with
slight change to menu text for length and content.

Submitted by:	Allan Jude <freebsd@allanjude.com>
Approved by:	re (glebius)
Fix vmbus channel memory leak where incorrect length parameter was
being passed to contigfree().

Submitted by:	Microsoft hyperv dev team
Approved by:	re@ (glebius)