MFhead 210529:

MFhead 210529:
  When installing a new ARP entry via 'arp -S', lla_lookup() will
  either find an existing entry, or allocate a new one. In the latter
  case an entry would have flags, that were supplied as argument to
  lla_lookup(). In case of an existing entry, flags aren't modified.

  This lead to losing LLE_PUB and/or LLE_PROXY flags.

  We should apply these flags either in lla_rt_output() or in the
  in.c:in_lltable_lookup(). It seems to me that lla_rt_output() is
  a more correct choice.

  PR:           kern/148784, kern/146539

git-svn-id: svn://svn.freebsd.org/base/stable/8@212735 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f