daemon/container: stream & decode JSON

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
image: stream img JSON & Decode in LoadImage

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
volume: stream JSON & Decode

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #8946 from unclejack/stream_decode

Decode JSON to avoid ReadFile