System tests: cleanup in --format test

Followup to #15673 (--format with newlines). I cobbled up a test
for it, but I was sloppy, so the test had issues that I kept
having to band-aid. This is a cleaner way to handle podman-machine.

...and, another unexpected surprise with podman stats. It
fails under rootless cgroupsv1. We can't sweep it under the
rug via skip_if_ubuntu because tests will then fail on RHEL8.
So, add a similar mechanism for testing podman stats.

...plus a non-surprise, the 'search' test flakes. Try minimizing
that by searching only $IMAGE. If quay.io is down, other tests
will certainly fail.

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

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