MFC r266310

MFC r266310

  Fix wrong formatting of 0.0.0.0/X table records in ipfw(8).

  Add `flags` u16 field to the hole in ipfw_table_xentry structure.
  Kernel has been guessing address family for supplied record based
  on xent length size.
  Userland, however, has been getting fixed-size ipfw_table_xentry structures
  guessing address family by checking address by IN6_IS_ADDR_V4COMPAT().

  Fix this behavior by providing specific IPFW_TCF_INET flag for IPv4 records.

PR:		bin/189471,kern/200169

git-svn-id: svn://svn.freebsd.org/base/stable/10@287963 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f