MFC r339586:

MFC r339586:

  In bhyve's fbuf emulation improve the overall "usage" message and
  for the vga option, rather than printing the entire option string,
  only print vga (as we do for everything else).

MFC r339681:

  Allow the bhyve VNC server to listen on IPv6 for incoming connections.

  Alternatively to IPv4 address:port this will allow to listen on IPv6
  link-local (incl. scope), a specific address, or ::.  Addresses have
  to be given in RFC2732 format so that [::]:port parsing will work.

  This patch also starts to introduce WITH_INET/INET6_SUPPORT to bhyve.

PR:			232018
  Submitted by:	Dave Rush (northwoodlogic.free gmail.com) (original)
  Reviewed by:	Dave Rush (updated verison)

Approved by:	re (kib)