pt-online-schema-change: Improve logging of thresholds

Registered by Simon J Mudd

When logging the changes made in pt-online-schema-change, several thresholds can be checked. However these are not shown during the normal output so if you happen to be close to the limit you may not realise and later the script may abort. This is not helpful. Please consider logging the checked thresholds like: Threads_running when showing how much work has been done, even if this is an optional parameter, such as --log-thresholds.

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