Problem/Justification
I would like to be able to persist custom modifications to docker.json. Specifically, to be able to add a default logging driver, though there are many potential uses for this.
Impact
Allow custom mods to docker.json to persist across reboots.
User Story
User should have ability in the UI (Apps/Configuration/Settings) to enter custom JSON text to specify a custom docker.json that persists across reboots.