netmap: add new package

this adds netmap, the fast packet I/O framework
http://info.iet.unipi.it/~luigi/netmap/



    - updated to latest version to get kernel 4.1 support
    - fixed printf type issue
    - Fixed manual config options

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>