Stop sending json-file by default
Stop sending json-file by default

By doing this we were over-riding any of the daemon's defaults.
Instead we can send an empty string which docker-py sends on
and the daemon interprets as, 'json-file' as a default if it
hasn't got any other daemon level config options.

Signed-off-by: Mazz Mosley <a54aae760072825ca6733a7dfc4aa39211f100a9@houseofmnowster.com>

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