daemon-util: pass --oknodo at rotate_logs

daemon-util's rotate_logs() did not pass --oknodo to start-stop-daemon while
HUPing the daemon processes. As a result, rotate_logs would fail for a
non-running daemon causing rotate_all_logs to exit prematurely.

We can fix this by either passing --oknodo to start-stop-daemon, or have
rotate_all_logs ignore any errors. The former is probably a safer approach - as
it doesn't mask any potential coding errors in rotate_logs - and is also
semantically correct (we only care about log rotation if a daemon is actually
running).

Signed-off-by: Apollon Oikonomopoulos <apoikos@gmail.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>