Werk #3256: blade_bx_powerfan: fixed wrong levels handling and minor cleanup

Component	Checks & agents
Title	blade_bx_powerfan: fixed wrong levels handling and minor cleanup
Date	Mar 2, 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) 1.2.8b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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