MFC r266494:

  - Fix a bug which can make sysctl() fail when -F is specified.
  - Increase WID_IF_DEFAULT() from 6 to 8 (the default for AF_INET6) because
    we have interfaces with longer names than 6 chars like epairN{a,b}.
  - Style fixes.
MFC r266857:

  - Add rwlock to struct dadq.  A panic could occur when a large number of
    addresses performed DAD at the same time.
MFC r258580:
  Replace Sun RPC license in TI-RPC library with a 3-clause BSD license,
  with the explicit permission of Sun Microsystems in 2009.

MFC r258581, 258582:
  Replace Sun Industry Standards Source License for Sun RPC code with a
  3-clause BSD license as specified by Oracle America, Inc. in 2010.
  This license change was approved by Wim Coekaerts, Senior Vice
  President, Linux and Virtualization at Oracle Corporation.

MFC r259117, 259118:
  Replace Sun RPC license with a 3-clause BSD license.  This license change
  was approved in 2010 by Wim Coekaerts, Senior Vice President, Linux and
  Virtualization at Oracle Corporation.

MFC r259417:
  Replace Sun RPC license for TI-RPC library with a 3-clause BSD license,
  with the explicit permission of Sun Microsystems in 2009.
  The code in question in this file was copied from lib/libc/rpc/pmap_getport.c.
MFC r256695:
  - Add relative specification in expiration time.
  - Add proto3 option for RTF_PROTO3.
  - Use %lu for members of struct rt_metrics.
MFC r256715:
  Use long explicitly for the time difference.
MFC r257036:

  Return 0 if:

    1. "-u N" specified, no -f, and mdN found,
    2. no -u, "-f /pathname" specified, and mdN associated with /pathname found,
    3. "-u N" specified, "-f /pathname" specified, and both of them found,
    4. "-l" specified and no -f,
    5. "-l" specified, "-f /pathname" specified, and /pathname found.

  otherwise return -1.