System tests: fix a multiarch problem

The multi-image load test was failing on non-x86_64 arch,
because the images used by the test (:00000000, :20200902)
did not have manifests for the given arch.

Solution: all we need are two nonlocal images. Use the
predefined NONLOCAL_IMAGE for one, and a new :multiimage
tag (manually created, currently == :20210610) for the other.
Document, so if/when RHEL adds new supported arches, the
test will fail but a maintainer will have a clue what to do.

Also, as long as I'm in here: add 'image prune -f' to teardown
in build.bats, to avoid seeing lots of red "stray image"
warnings in test logs.

Also: skip a broken/flaky python test

Signed-off-by: Ed Santiago <santiago@redhat.com>

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