Rollup merge of #57740 - JakubOnderka:ipv4addr-to_ne_bytes, r=scottmcm
Rollup merge of #57740 - JakubOnderka:ipv4addr-to_ne_bytes, r=scottmcm

Use `to_ne_bytes` for converting IPv4Addr to octets

It is easier and it should be also faster, because [`to_ne_bytes`](https://doc.rust-lang.org/std/primitive.u32.html#method.to_ne_bytes) just calls `mem::transmute`.

graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust