
It is perfectly valid to want to add a value to a file that does not exist yet, even the path may be missing. This fixes last night regression when installing docker no longer creates the /etc/docker folder, causing our MTU update to fail. Change-Id: I0f037d1d6664de3c3b777aaf6da9cd7c3e8bb15f Reference: https://review.rdoproject.org/zuul/builds?job_name=tox-py36-ci-config&project=rdo-infra/ci-config