Add ContainerCreateResponse type
Add ContainerCreateResponse type

This type is produced on the server side and is a type safe struct that
can be encoded to json.  It is consumed via the client.

Signed-off-by: Michael Crosby <951f4c7b5d47e32d0112c78d14a98eaa23e6b5ef@gmail.com>

jwhonce/engine-api,rhatdan/engine-api,vdemeester/engine-api,docker/engine-api,mikedougherty/engine-api,msabansal/engine-api,thaJeztah/engine-api