Merge r204499, r204515 from head to stable/8:

Merge r204499, r204515 from head to stable/8:

  Teach netstat -Q to work with -N and -M by adding libkvm versions of data
  query routines.  This code is necessarily more fragile in the presence of
  kernel changes than querying the kernel via sysctl (the default), but
  useful when investigating crashes or live kernel state via firewire.

  Sponsored by:   Juniper Networks

  Prefer vocabulary of 'Current' and 'Limit' to 'Value' and 'Maximum' in
  netstat -Q.

  Sponsored by:   Juniper Networks

git-svn-id: svn://svn.freebsd.org/base/stable/8@217458 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f