Werk #3630: docsis_channels_upstream: fixed channel discovery

Component	Checks & agents
Title	docsis_channels_upstream: fixed channel discovery
Date	May 31, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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