Use std::net::SocketAddrV4; not hand rolled parsing

[emostov]

Instead of this:

qos/qos-host/src/cli.rs

Lines 69 to 76 in b862fb3

	if let Some(cap) = iter.next() {
	let ip1 = parse(&cap[1]);
	let ip2 = parse(&cap[2]);
	let ip3 = parse(&cap[3]);
	let ip4 = parse(&cap[4]);
	self.ip = Some([ip1, ip2, ip3, ip4]);
	}

We can use this:

https://doc.rust-lang.org/std/net/struct.SocketAddrV4.html#method.from_str

For consistency, we should also standardize code apis to always take SocketAddrV4 and not ([u32, 4], u16)

[emostov]

Closed by #27