Werk #12085: Use Python2 pendant of mailman_lists agent plugin

Component Checks & agents
Title Use Python2 pendant of mailman_lists agent plugin
Date Mar 3, 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)
2.0.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Porting the "mailman_lists" agent plugin does not work out of the box due to the way the executable is used as a plugin. Prior to a real porting this change just rolls back to Python2 for this plugin.

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