Werk #14076: Alertmanager special agent: Handle credentials from password store correctly

Component	Agent bakery
Title	Alertmanager special agent: Handle credentials from password store correctly
Date	May 20, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The Alertmanager special agent did not handle credentials from the password store correctly, leading to connection failures.

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