Added info about product, OS version, commit hash
and serial number to log filename to simplify
triage and quick sanity check of the logs in
cases many log files have to be analyzed.
Fixes and optimizations in logger:
* fixed possible buffer overflow when logging
logs over line buffer size;
* reduced max log line length to 2048;
* moved pubsetbuf before file opening;
* log file stream buffer created once
in logger ctor;
* updatet UTs;
* additional minor cleanup.
Due to losing bytes the logger has a worker
which is responsible for dumping logs to
the file. The logger also has its own timer
to dump logs every 15 minutes. EventManager
is not responsible for interval dumping logs
now.
