MFC r271424:

  - Add $netif_ipexpand_max to specify the upper limit for the number of
    addresses generated by an address range specification.  The default value
    is 2048.  This can be increased by setting $netif_ipexpand_max in rc.conf.

PR:	186841
MFC r272579:

  Bump .Dd missed in r271424
Merge remote-tracking branch 'freebsd/stable/10' into hardened/10/aslr