containers: Fix __init__ docstrings.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
images: Fix __init__ docstrings.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
Merge pull request #7 from jzupka/init_param_doc_fix

Doc string fix in containers, images