Export the connection interface

[stapelberg]

This way, packages can pass a ConnectionInt implementation around, which previously was not possible. I.e., previously you had to use dhcp4client.Connection(&literal{}) directly, now you can use:

func createClient(conn dhcp4client.ConnectionInt) *dhcp4client.Client {
    return dhcp4client.New(dhcp4client.Connection(conn))
}

[d2g]

Any reason for the interface name change?

[d2g]

Of course there is..

Yeah makes sense.