Disable cheaper on docker images

From https://discuss.tryton.org/t/usage-of-cheaper-option-of-uwsgi/2538

It seems that the cheaper option is buggy so we should provide a default configuration more stable.

assigned to @ced

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review289661002 updated at https://codereview.tryton.org/289661002/#ps287021002

New changeset e209e3eaa74f by Cédric Krier in branch 'default':
Disable µwsgi cheaper option
https://hg.tryton.org/tryton-docker/rev/e209e3eaa74f

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closed