Werk #6905: jolokia_generic: Don't discover wrong types

Component	Checks & agents
Title	jolokia_generic: Don't discover wrong types
Date	Nov 16, 2018
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The jolokia generic check no longer discovers services that would -- due to the wrong value type -- go to UNKNOWN anyway.

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