Werk #12703: Drop experimental PySNMP backend

Component	Agent bakery
Title	Drop experimental PySNMP backend
Date	Mar 11, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b2 Checkmk Enterprise (CEE), Checkmk MSP (CME)

The experimental PySNMP is dropped because it did not perform as expected. The classic backend will be selected instead for people who have set PySNMP previously.

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