Werk #3832: diskstat: added new device bcache

Component	Checks & agents
Title	diskstat: added new device bcache
Date	Aug 17, 2016
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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