Issue: Only load broker config files based on extension

[3v1n0]

Is there an existing issue for this?

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Describe the issue

We just load any file that is in /etc/authd/brokers.d/ but this could be a problem when dpkg updates may lead files in that files (e.g. *.dpkg-old ones), so it's safer to just load files *.conf.

Steps to reproduce it

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Ubuntu users: System information and logs

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Non Ubuntu users: System information and logs

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Relevant information

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Double check your logs

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