don't require a client cert for untrusted reqs
don't require a client cert for untrusted reqs

Since we have the concept of "trusted" and "untrusted" requests, and we
don't verify the client cert for untrusted requests, we may as well not
require one.

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

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