shadownaemon: refresh comments/downtimes on remote restart

it might occur, that a remote instance has changed its comments and downtimes during a restart,
so make sure comments and downtimes are syncronized completly after a restart.

Signed-off-by: Sven Nierlein <sven@nierlein.de>
shadownaemon: remove debug output and fix refresh interval

daemon used slow refresh interval after one minute already instead of 10 minutes.
Probably a testing leftover.

Signed-off-by: Sven Nierlein <Sven.Nierlein@consol.de>
shadownaemon: use requests to determince activity

connections may not increase when using keepalive but requests will always
increase on activity. Continue with short interval as soon as there was some
activity.

Signed-off-by: Sven Nierlein <sven@consol.de>