Move secret-verify-leak containerfile into its own Directory

Secret-verify-leak is causing flakes, when running in parallel tests.
This is because remote secrets are copied into the context directory to
send to the API server, and secret-verify-leak is doing a COPY * and
then checking if the temporary secret file ends up in the container or
not. Since all the temporary files are prefixed with
"podman-build-secret", this test checks if podman-build-secret is in the
image. However, when run in parallel with other tests, other temporary
podman-build-secrets might be in the context dir. Moving
secret-verify-leak into its own directory makes sure that the context
dir is used only by this one test.

Also renamed Dockerfile -> Containerfile and cleaned up unused
Containerfiles.

Signed-off-by: Ashley Cui <acui@redhat.com>

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