Open InnoDB tables in parallel

Registered by Evgeniy Stepchenko

Currently opening table is serialized, and it is especially bad at start time, when InnoDB takes probes during opening table, as it is slow operation. See also http://www.mysqlperformanceblog.com/2006/11/21/opening-tables-scalability/. Partially it can be fixed by recent patches by enabling / disabling probes and changing count of probes, but still the solution is far from perfect

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