logging: added log rotation and improved predictability of log sweep #1562
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With this change logs will be rotated every 50 MB, which prevents
accumulation of giant files while server is running.
This change will also guarantee that log sweep completes at least once
before each invocation of Kopia finishes. Previously it was a goroutine
that was not monitored for completion.
Flags can be used to override default behaviors:
--max-log-file-segment-size
--no-wait-for-log-sweep
- disables waiting for full log sweepFixes #1561