Control of QUERY_RESPONSE_TIME query collecting

Registered by Oleg Tsarev on 2011-07-03

We should able to control QUERY_RESPONSE_TIME on slave.
We should add variable, something like "query_response_time_sql_slave_stats" - and choose between:
1) count just queries from SQL_Slave_Thread (from master)
2) count just queries from slave (from user)
3) both.

Need discuss about control - two variants:
1) Just enable/disable count quiries from SQL_Slave_Thread
2) Full control (as I decribed before - both/sql_slave_thread/user)

After discussion QA should prepare tests for that.

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Drafter:
Oleg Tsarev
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