fix(learn) avoid learn use DEFAULT_POOL #2126
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FLAGS_max_copy_rate_megabytes_per_disk will use `sleep_for` function to block THREAD_POOL_DEFAULT. It's cause replica server cannot deal `remote command`. This modify is same as FLAGS_max_send_rate_megabytes_per_disk, only use THREAD_POOL_BLOCK_SERVICE to sleep. relate issue:apache#1969
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FLAGS_max_copy_rate_megabytes_per_disk will use
sleep_forfunction to block THREAD_POOL_DEFAULT. It's cause replica server cannot dealremote command. This modify is same as FLAGS_max_send_rate_megabytes_per_disk, only use THREAD_POOL_BLOCK_SERVICE to sleep.What problem does this PR solve?
relate issue:#1969
avoid learn use DEFAULT_POOL.
Before fix, many partitions ballot increase, and remote_command cannot get response.
After fix, return to normal.