Add the VM name to the process name with setproctitle().
Remove the VM name from some of the thread-naming calls
since it is now in the proc title.
Slightly modify the thread-naming for the net and block
threads.

This improves readability when using top/ps with the -a
and -H options on a system with a large number of bhyve VMs.

Requested by:	Michael Dexter
Reviewed by:	neel
MFC after:	4 weeks
Do not build aicasm with the cross-tools/kernel-toolchain, instead add a
proper kernel-tools step/target modeled after the world build-tools stuff.