Use ListOpt for labels.
Use ListOpt for labels.

Signed-off-by: Daniel Nephin <6347c07ae509164cffebfb1e2a0d6ed64958db19@docker.com>
(cherry picked from commit 6c3b44f755cbf2564171a012fc55942862f3ede9)
Signed-off-by: Victor Vieux <ce584ac70734cfa5a848cd28039798932c7ea675@docker.com>

stainboy/docker,stainboy/docker,stainboy/docker,medallia/docker,medallia/docker,medallia/docker,medallia/docker