[Merge] ~liushuyu-011/ubuntu/+source/davmail:ubuntu/devel into ubuntu/+source/davmail:ubuntu/devel

[git-ubuntu bot]

You have been requested to review the proposed merge of ~liushuyu-011/ubuntu/+source/davmail:ubuntu/devel into ubuntu/+source/davmail:ubuntu/devel.

For more details, see:
https://code.launchpad.net/~liushuyu-011/ubuntu/+source/davmail/+git/davmail/+merge/448108

This fixes the autopkgtest failure where nc printed out a "connection successful" message to stderr and failing the test.

-- 
Your team Ubuntu Sponsors is requested to review the proposed merge of ~liushuyu-011/ubuntu/+source/davmail:ubuntu/devel into ubuntu/+source/davmail:ubuntu/devel.
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