retry uploading

As it turns out, uploading is often the reason why the process
crashes/exits. This is bad because it means that 1) we lose links to
logs (as they are not being uploaded), leading to incomplete reporting
and 2) we rely on an external watchdog to keep the service alive (and
I'd rather just not have ezau crashing, especially on Windows where we
usually don't supervise it with systemd).

Therefore, a configuration setting has been added that lets ezau retry
the upload process. This is not 100% good and failsafe, because

1) it always waits a hardcoded amount of seconds (instead of e.g. using
   a proper backoff timer)
2) it blocks the rest of the process, so no logs will be compressed
   while it is retrying a single log
3) after those retries, the process will still exit

But it is a good first approximation, and the aforementioned issues can
be fixed "relatively easily" (e.g. by moving the whole per-log logic
into a separate thread(pool) and handling failures even better).

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