Mirror serial console to netconsole.
To use netconsole executre the following command on a host connected to wrpc:
nc -u <IP> 55

Send of a command is triggered by a newline.
To see output in the netconsole any command (even empty line) has to be sent
first.
Signed-off-by: Adam Wujek <adam.wujek@cern.ch>