do not poll the syslog api call multiple times simultaneously,
since it can be very costly, depending on the journal size
with this, there is always only one per client
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
use the view, viewmodel, controller style code, which makes the logic
much more understandable
this adds two features to it, namely a viewBuffer range, which controls
the distance to the end of the data on which the panel loads the next data
and an optional failCallback, which will be used for the cephlog
this also fixes#2151
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
