Import FB MySQL fix for SHOW signed variables

Registered by George Ormond Lorch III

For plugin variables that are signed numbers, doing a SHOW VARIABLES will always show an unsigned number. Fix this by adding more types to the SHOW_* enums and then based on that, calling the *10_to_str functions appropriately.

https://github.com/facebook/mysql-5.6/commit/97acbd60eccf96962cdce9b01b2bc67f4291bcce

Blueprint information

Status:
Complete
Approver:
George Ormond Lorch III
Priority:
Medium
Drafter:
George Ormond Lorch III
Direction:
Approved
Assignee:
George Ormond Lorch III
Definition:
Approved
Series goal:
Accepted for 5.7
Implementation:
Implemented
Milestone target:
milestone icon 5.7.18-14
Started by
George Ormond Lorch III
Completed by
George Ormond Lorch III

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