GetStrategy returns the specific network strategy for the provided type.

Loopback is a network strategy that provides a basic loopback device.

crosbymichael: could make a network strategy that instead of returning veth pair names it returns a pid to an existing network namespace.

Veth is a network strategy that uses a bridge and creates a veth pair, one that stays outside on the host and the other is placed inside the container's namespace.

NetworkStrategy represents a specific network configuration for a container's networking stack.