MFC r260047: Clean up license text

  - Renumber Regents clauses
  - Remove clause 3 and 4 from TNF license, following upstream change

Sponsored by:	The FreeBSD Foundation
MFC r270512 r270513 r270754
   - add comments which describe exit status codes of /usr/sbin/bhyve
   - move bhyvectl --destroy outside of the while loop
   - Use "file -s" so that we can run vmrun.sh against special devces such as
     /dev/md memory files systems or zvols