check "/etc/systemd/system/docker.service" instead of
"/lib/systemd/system/docker.service" in ubuntu.
In Ubuntu,
the settings in "/etc/systemd/system/docker.service"
will overwrite the settings in "/lib/systemd/system/docker.service"
Change-Id: Idd5b99643b4fb9a4800f5d450e9aaeb22210aa8b
Closes-Bug: #1569644