Add send callbacks with optional debug handler
Add send callbacks with optional debug handler

libnl supports callbacks for send and recv.  This patch enables callbacks
for sent messages and uses the debug callback for the --debug option, as
the recv callbacks do.

Signed-off-by: Sean Robinson <7a2b0397fbd27fc50c075c6d7633231d34f626e1@gmail.com>

bw-oss/iw,TeamEOS/external_iw,CTU-IIG/802.11p-iw,OSLL/iw,timduru/platform-external-iw,SoluMachines/external_iw,TeamEOS/external_iw,chunyeow/iw,CTU-IIG/802.11p-iw,OSLL/iw,greearb/iw-ct,cozybit/iw,timduru/platform-external-iw,Distrotech/iw,bw-oss/iw,chunyeow/iw,SoluMachines/external_iw,greearb/iw-ct,Distrotech/iw,cozybit/iw