podman generate kube - add actual tests

This exposed a nasty bug in our system-test setup: Ubuntu (runc)
was writing a scratch containers.conf file, and setting CONTAINERS_CONF
to point to it. This was well-intentionedly introduced in #10199 as
part of our long sad history of not testing runc. What I did not
understand at that time is that CONTAINERS_CONF is **dangerous**:
it does not mean "I will read standard containers.conf and then
override", it means "I will **IGNORE** standard containers.conf
and use only the settings in this file"! So on Ubuntu we were
losing all the default settings: capabilities, sysctls, all.

Yes, this is documented in containers.conf(5) but it is such
a huge violation of POLA that I need to repeat it.

In #14972, as yet another attempt to fix our runc crisis, I
introduced a new runc-override mechanism: create a custom
/etc/containers/containers.conf when OCI_RUNTIME=runc.
Unlike the CONTAINERS_CONF envariable, the /etc file
actually means what you think it means: "read the default
file first, then override with the /etc file contents".
I.e., we get the desired defaults. But I didn't remember
this helpers.bash workaround, so our runc testing has
actually been flawed: we have not been testing with
the system containers.conf. This commit removes the
no-longer-needed and never-actually-wanted workaround,
and by virtue of testing the cap-drops in kube generate,
we add a regression test to make sure this never happens
again.

It's a little scary that we haven't been testing capabilities.

Also scary: this PR requires python, for converting yaml to json.
I think that should be safe: python3 'import yaml' and 'json'
works fine on a RHEL8.7 VM from 1minutetip.

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

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