This was tricky to get right:
- The 'stride' value used for 8 and 16 bit values must behave inverse to
  the value's intra word offset to work correctly with big-endian data
  act_pedit is editing.
- The 'm' array's values are in host byte order, so they have to be
  converted as well (and the ordering was just inverse, for some
  reason).
- The only sane way of getting this right is to manipulate value/mask in
  host byte order and convert the output.
- TIPV4 (i.e. 'munge ip src/dst') had it's own pitfall: the address
  parser converts to network byte order automatically. This patch fixes
  this by converting it back before calling pack_key32, which is a hack
  but at least does not require to implement a completely separate code
  flow.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>