Werk #2586: ibm_imm_fan: lower and upper levels are now configurable

Component	Checks & agents
Title	ibm_imm_fan: lower and upper levels are now configurable
Date	Sep 9, 2015
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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