imap-dl: use retriever.authentication configuration

After discussion with Sean Whitton and Robbie Harwood, I think makes
more sense to have a straight "retriever.authentication" configuration
setting rather than a rather odd boolean "use_kerberos".

This is a divergence from getmail, but that seems OK at this point.

The implementation now also makes it pretty straightforward to add new
authentication mechanisms if someone wants to add them.

One additional thing that would be nice would be for imap-dl to be
able to dynamically choose the "best" available authentication method.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthorseman.net>

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