Instead of changing Docker daemon command line let's change config
for Docker instead. In /etc/docker/daemon.json file as it should be.
Custom Docker options can be set with 'docker_custom_config' variable.
Old 'docker_custom_option' is still present but should be avoided.
Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Change-Id: I1215e04ec15b01c0b43bac8c0e81293f6724f278