Werk #13641: Fix 'ValueError: MAC check failed' error in "Rewriting rulesets" phase of update

Component	Core & setup
Title	Fix 'ValueError: MAC check failed' error in "Rewriting rulesets" phase of update
Date	Mar 25, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The update procedure from 2.0 was accessing the password store for reading before rewriting it to the new 2.1 format. This could make updates from 2.0 to 2.1 fail.

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