rewrite podman-cp

* Add a new `pkg/copy` to centralize all container-copy related code.

* The new code is based on Buildah's `copier` package.

* The compat `/archive` endpoints use the new `copy` package.

* Update docs and an several new tests.

* Includes many fixes, most notably, the look-up of volumes and mounts.

Breaking changes:

 * Podman is now expecting that container-destination paths exist.
   Before, Podman created the paths if needed.  Docker does not do
   that and I believe Podman should not either as it's a recipe for
   masking errors.  These errors may be user induced (e.g., a path
   typo), or internal typos (e.g., when the destination may be a
   mistakenly unmounted volume).  Let's keep the magic low for such
   a security sensitive feature.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

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