host/logbuf: Remove test for line counting.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
host/logbuf: Read the rotated logs as well.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>
host/logbuf: Test out support for log rotation.

Signed-off-by: Blaž Hrastnik <blaz.hrast@gmail.com>