Werk #11704: ibm_mq: Various bugfixes

Component	Checks & agents
Title	ibm_mq: Various bugfixes
Date	Jan 26, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The ibm_mq plugins had various bugs from Checkmk version 2.0.0b1 to 2.0.0b5. In particlar, the check plugin ibm_mq_queues would not run at all. The check plugin is now compatible with python3.

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