Support for Restart Policy

[shreyaskarnik]

Support for specifying restart policy through the remote API while creating containers. This will be very handy.

[abevoelker]

👍 This would definitely be really useful.

[dlemphers]

This is great! Cherry picked this until it gets rolled in, as there isn't any other way to excite the new restart feature remotely via the API. Thanks @shreyu86!! 👍