MFS r239854 (including MFC r239601, r239602, r239621):

MFS r239854 (including MFC r239601, r239602, r239621):

 Remember that I'm using length-defined strings in parameters:

  Don't include the null terminator when recomputing the parameter
  length when stripping the netmask from IP addresses.  This was
  causing later addresses in a comma-separated string to disappear.

  Use memcpy instead of strcpy.  This could just cause Bad Things.

  Add a null byte when comma-combining array parameters.

  Pre-separate IP addresses passed on the command line, so they can be
  properly parsed for interface prefixes and netmask suffixes.  This was
  already done for the old-style (fixed) command line, but missed for
  the new-style.

PR:		170832
Approved by:	re (kib)

git-svn-id: svn://svn.freebsd.org/base/releng/9.1@239871 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f