fixes #7802, when api version 1.11 is `json.Marshal`ing the container st...

fixes #7802, when api version 1.11 is `json.Marshal`ing the container struct

Signed-off-by: Jessica Frazelle <jfrazelle@users.noreply.github.com>
No. Starting from 1.12 we set manually all the fields: https://github.com/docker/docker/blob/master/daemon/inspect.go#L19 (raw is set only for <= 1.11)