add rtems/ne2000 driver
clean driver/sockets code git-svn-id: https://tecsw.estec.esa.int/svn/taste/trunk/po-hi-c@749 129961e7-ef38-4bb5-a8f7-c9a525a55882
clean driver/sockets code git-svn-id: https://tecsw.estec.esa.int/svn/taste/trunk/po-hi-c@749 129961e7-ef38-4bb5-a8f7-c9a525a55882