Werk #7556: Added missing MySQL-python module (needed by check_sql check)

Component	Other components
Title	Added missing MySQL-python module (needed by check_sql check)
Date	Mar 24, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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