utils.SignalWakeupFd: open pipe in binary mode
utils.SignalWakeupFd: open pipe in binary mode

Otherwise Python complains that we "can't have unbuffered text I/O".
Furthermore, we already write bytes to the pipe.

Signed-off-by: Apollon Oikonomopoulos <ed81ed0a45ccd5c8869bda52e38353a6299ee39e@dmesg.gr>

mbakke/ganeti,mbakke/ganeti,ganeti/ganeti,mbakke/ganeti,ganeti/ganeti,ganeti/ganeti