Add support for RX packet classification in a network device

This is a set of 3 patches, which is the modified version of the one posted on 02/09/09. It incorporates 2 changes:

1. The bulk of the classification code was moved to a new file - rxclass.c for the ethtool application source code.

2. The network structures in the classification interface have been defined to be in the network byte order and application and driver code have been modified to conform to this specification.

Regards,
--santwona