podman: add build flexibility to dependencies

In a similar manner to cri-o, we don't want to make meta-selinux
or meta-security a hard dependency to meta-virtualization. So we
implement a similar anonymous python check that allows the recipe
to be skipped if the dependent layers are not present (and hence
we are yocto compatible). If we get more than two recipes doing
layer checks (this is the 2nd), we can move the functionality to
a class.

We also make the runc dependency be virtual/runc versus picking
a specific provider (even if only runc-opencontainers has been
tested).

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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