Merge MySQL 5.6.35

Registered by Laurynas Biveinis

https://github.com/percona/percona-server/pull/1272

Merge MySQL 5.6.35.

Verify upstream and revert our bugfixes:
- bug 1580993 / https://bugs.mysql.com/bug.php?id=80014
- bug 1626002 / https://bugs.mysql.com/bug.php?id=83073
- bug 1621012 / https://bugs.mysql.com/bug.php?id=82886
- bug 1351148 / https://bugs.mysql.com/bug.php?id=73979
- bug 1641612 (readdir_r part) / https://bugs.mysql.com/bug.php?id=82515

Add testcases for: 76039 (missed in 5.6.30), 78064 (missed in 5.6.29), 78230 (missed in 5.6.30), 80134 (missed in 5.6.31), 80438 (missed in 5.6.32), 75943 (missed in 5.6.31), 81407 (missed in 5.6.32), 81409 (missed in 5.6.33), 81412, 81447 (missed in 5.6.33), 81457, 81471, 81495 (missed in 5.6.31)

Blueprint information

Status:
Complete
Approver:
Laurynas Biveinis
Priority:
Essential
Drafter:
Laurynas Biveinis
Direction:
Approved
Assignee:
Yura Sorokin
Definition:
Approved
Series goal:
Accepted for 5.6
Implementation:
Implemented
Milestone target:
milestone icon 5.6.35-80.0
Started by
Laurynas Biveinis
Completed by
Yura Sorokin

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