Merge MySQL 5.5.56

Registered by Laurynas Biveinis

https://github.com/percona/percona-server/pull/1862

Merge MySQL 5.5.56.

Add testcases for: 83816/84658/81449 (missed in 5.5.55; probably a single testcase is enough)

Blueprint information

Status:
Complete
Approver:
Laurynas Biveinis
Priority:
Essential
Drafter:
Laurynas Biveinis
Direction:
Approved
Assignee:
Yura Sorokin
Definition:
Approved
Series goal:
Accepted for 5.5
Implementation:
Implemented
Milestone target:
milestone icon 5.5.57-38.9
Started by
Yura Sorokin
Completed by
Yura Sorokin

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