3769: Allow up to crunch_limit_log_event_throttle_rate per
crunch_limit_log_event_throttle_period, then silence the logs until the next
crunch_limit_log_event_throttle_period.
Merge branch 'master' into 3769-throttle-logs
Merge branch '3052-crunch-log-stdout' into 3769-throttle-logs
3769: Add rate_limit with log throttling logic.  Multiple configuration
parameters to throttle excessive logging by bytes, lines, logs table events,
and total logged output.
3769: Tweak throttle/truncate messages and application.default.yml defaults.
Merge branch 'master' into 3769-throttle-logs

Conflicts:
	services/api/script/crunch-dispatch.rb
3769: Spelling fix and remove debugging puts.
Merge branch '3769-throttle-logs' closes #3769