Werk #11645: Performance issues with PySNMP Backend

Component	Core & setup
Title	Performance issues with PySNMP Backend
Date	Nov 10, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

PySNMP had some huge Performance issues. These issues are resolved by

1. Caching the SnmpEngines PySNMP uses
2. Disabling lookupMib

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