BroadcastAddr returns the last address in the given network, or the broadcast address.

DecrementIP returns the given IP + 1.

IncrementIP returns the given IP + 1.

NetworkAddr returns the first address in the given network, or the network address.

* * This function was copied from the following repo [0] * as we depend on pkg/ns, but it doesnot support netns creation * [0] github.com/containernetworking/plugins.git:pkg/testutils/netns_linux.go */.