Werk #3633: check_sql: minor cleanup in active check_sql, fixed performance data handling

Component	Checks & agents
Title	check_sql: minor cleanup in active check_sql, fixed performance data handling
Date	Jun 6, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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