Werk #4350: check_sql: Make database server to connect to configurable

Component	Checks & agents
Title	check_sql: Make database server to connect to configurable
Date	Feb 28, 2017
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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