add column user_max to history table, as describled in https://www.percona.c…#142

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Commits on Oct 10, 2015

add user_max to history table, as describled in https://www.percona.com/doc/percona-toolkit/2.0/pt-query-digest.html#cmdoption-pt-query-digest--review-history, this will cause pt-query-digest tool …
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