MFC r208036:

MFC r208036:

  Increase the target buffer for performing NGM_ASCII2BINARY conversion
  from 2000 bytes to 20 Kbytes, which now matches the buffer size used for
  NGM_BINARY2ASCII conversions.

  The aim of this change is to allow for bigger binary structures to be
  managed via netgraph ASCII messages, until we come up with an API
  improvement which would get rid of such arbitrary hardcoded limits.

git-svn-id: svn://svn.freebsd.org/base/stable/8@208146 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f