Support for duplicate labels (but different values) was
deprecated in commit e4c9079d091a2eeac8a74a0356e3f348db873b87
(Docker 1.13), and scheduled for removal in 17.12
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 8c6322338c91cdb88b1fef4def393d9a7b670366
Component: engine