Don't create multiple writer streams for the same underlying file, instead
store the writer stream on the log instance, and return it whenever needed.
This fixes an issue where there would be multiple writer streams, which could
cause exceptions when creating more writer streams (access defined errors
because the file is already open).
Make sure as much as possible is written to the logs, and not stdout.
Also copy an extra 1024 bytes when fetching the system log (and continue
capturing a while after stopped, since there may be unflushed system log
data in memory).
Rolf Bjarne Kvinge