Use `Default()` instead of re-loading containers.conf.
Also rework how the containers.conf objects are handled for parsing the
CLI. Previously, we were conflating "loading the defaults" with
"storing values from the CLI" with "libpod may further change fields"
which ultimately led to various bugs and test failues.
To address the issue, separate the defaults from the values from the CLI
and properly name the fields to make the semantics less ambiguous.
[NO NEW TESTS NEEDED] as it's not a functional change.
Fixes: containers/common/issues/1200
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
4e29ce2baf