Werk #11524: check_mail: Fix cleanup of messages ('Namespace' object has no attribute 'cleanup_messages')

Component	Checks & agents
Title	check_mail: Fix cleanup of messages ('Namespace' object has no attribute 'cleanup_messages')
Date	Jan 12, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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