add parameter to ajust merging for insert buffer

Registered by Evgeniy Stepchenko

add parameter to make the merging more active
    currently, we can control the activity by innodb_io_capacity.
    but, it may be still insufficient for high-end hardware.

This parameter will be implemented as the additional part of "innodb_io_patches".
http://www.percona.com/docs/wiki/percona-xtradb:innodb_io

Blueprint information

Status:
Complete
Approver:
Vadim Tkachenko
Priority:
High
Drafter:
Yasufumi Kinoshita
Direction:
Needs approval
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Yasufumi Kinoshita
Completed by
Yasufumi Kinoshita

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