For Podman 6, we still have providers and will continue to have a default provider for each platform. But where a platform has multiple providers, we want users to be able to cross provider boudnaries imposed in Podman 4/5. The key change is to look up virtual machines by name, as before, but to then also iterate all possible providers. As of this PR, init will still only create with the default provider, but a subsequent PR will introdouce an provider override.
I also removed the "--all-providers" command line option on `podman
machine ls` because it no longer makes sense. And I marked the all
provider list test to be skipped.
Signed-off-by: Brent Baude <bbaude@redhat.com>
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