By convention, containers spawned by jenkins jobs have the name:
docker-pr${BUILD_NUMBER}
That works fine for jobs with a single container. This commit cleans up
when multiple containers are spawned with the convention that their names
share the same "docker-pr${BUILD_NUMBER}-" prefix.
Signed-off-by: Tibor Vass <tibor@docker.com>
(cherry picked from commit f470698c2c10c2382080fab34f83088450fabdd6)
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>