Merge MySQL 5.6.39

Registered by Laurynas Biveinis on 2017-10-09

MIGRATED TO https://jira.percona.com/browse/PS-306

Merge MySQL 5.6.39

Verify upstream fixes, and revert ours, keeping the testcases as needed:
- https://bugs.mysql.com/bug.php?id=86209 / bug 1688698

Add testcases for:
77522=77523=77527 (internal #20857652) (take from Percona Server 5.7.20)

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Drafter:
Laurynas Biveinis
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Definition:
Drafting
Series goal:
Accepted for 5.6
Implementation:
Deferred
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