Fix sig-proxy=false test and use image cache

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Pulling fedora-minimal was potentially causing timeouts, which is
bad. Using the cache avoids that.

Sig-proxy=false test was entirely nonfunctional - I think we
didn't update it when we fixed sig-proxy=true to be less racy.
It was still passing, which is concerning.

Signed-off-by: Matthew Heon <mheon@redhat.com>

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