Document per-query variables

Registered by Alexey Kopytov

This is to document https://code.launchpad.net/~vlad-lesin/percona-server/5.6-per_query_variables_settings/+merge/144082

http://www.percona.com/doc/percona-server/5.6/management/statement_timeout.html should also be update to mention that per-query timeouts can be specified using the per-query variables syntax.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Hrvoje Matijakovic
Definition:
Approved
Series goal:
Accepted for 5.6
Implementation:
Implemented
Milestone target:
milestone icon 5.6.15-63.0
Started by
Hrvoje Matijakovic
Completed by
Hrvoje Matijakovic

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