Upgrade Docker CE on master

Use the standard Debian distribution mechanism supported
by Docker and upgrade to the latest 18.x version for
Debian Jessie.

Change-Id: Ic90ac5443ef907ba651117fe37847fc5e498cc52
1 file changed
tree: 5daf92ec5bd0261c7a6ed8a2a1704f889fd5163c
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore