Rebase on MySQL 5.6.12

Registered by Laurynas Biveinis

Rebase on MySQL 5.6.12.

Points to address:
- re-enable the commented-out crash injection sites in group_commit_crash.test to confirm that http://bugs.mysql.com/bug.php?id=68932 was really fixed.

- Verify the upstream fix and revert our fix for bug 1035225.
- Verify the upstream fix and revert our fix for bug 1155859.
- Verify the upstream fix and revert our fix for bug 1135097.
- Verify the upstream fix and revert out fix for bug 1017192.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Essential
Drafter:
Laurynas Biveinis
Direction:
Approved
Assignee:
Laurynas Biveinis
Definition:
Approved
Series goal:
Accepted for 5.6
Implementation:
Implemented
Milestone target:
milestone icon 5.6.12-60.4
Started by
Laurynas Biveinis
Completed by
Laurynas Biveinis

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