add info_before flag

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
remove obsolete unicode call in python3

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
cleanup display in iotop

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>