- Format the usage so that it fits in 80 cols and follows the standard
  convention for long usage lines in manpages.
- Sort the option string passed to getopts and the case statements for
  the option returned by getopts.
- Add a -C option to specify the device to be used for the console
  (defaults to 'stdio')  (This could be let vmrun be run in the background
  by using /dev/nmdm0B or the like)
- Add a -H option to specify a host path to pass to bhyveload(8) via
  -h to back the host0: filesystem in bhyveload(8) (useful for loading
  kernels from the host into the guest without having to copy them into
  the guest's disk image first)

Reviewed by:	neel
MFC after:	2 weeks
Don't free an mbuf twice. This only happens in very rare error
cases where the peer sends illegal sequencing information in
DATA chunks for an existing association.

MFC after: 3 days.