Werk #12299: Improve SNMP caching

Component	Checks & agents
Title	Improve SNMP caching
Date	Apr 27, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

We now cache the data fetched from SNMP discovery and checking in different databases. This should improve performance on some installations.

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