Stable Networking: Keep the same network settings across container restarts.

This change will allocate network settings (IP and public ports) at
container creation rather than start and keep them throughout the
lifetime of the container (i.e. until it gets destroyed) instead of
discarding them when the container is stopped.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
Daemon: Restore network settings at startup.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>