This commit adds support for expanded ports in Compose loader,
and add several unit tests for loading expanded port format.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
The original Compose config loading used the `compose` tag, which
was replaced by mapstructure. Some fields were left on the old tag. This
commit removes the old tag and uses types and mapstructure.
Signed-off-by: Daniel Nephin <dnephin@docker.com>
Yong Tang