Yong Wen Chua 62f8b1402e Implement userns_mode HostConfig for services
Fixes #3349

This allows the key `userns_mode` to be used in service definitions.
Since `userns_mode` requires API version > 1.23, this is only available
in 2.1 and 3.0 versions of compose file

Signed-off-by: Yong Wen Chua <me@yongwen.xyz>
2016-12-05 14:25:56 +08:00
..