* uses sendmmsg in streamer (#23062)
packet::send_to sends packets one by one:
https://github.com/solana-labs/solana/blob/9213fcb11/streamer/src/packet.rs#L63-L75
sendmmsg uses a single system call for multiple messages:
https://github.com/solana-labs/solana/blob/9213fcb11/streamer/src/sendmmsg.rs#L94
(cherry picked from commit c078ca3fb3
)
# Conflicts:
# streamer/src/streamer.rs
* removes mergify merge conflicts
Co-authored-by: behzad nouri <behzadnouri@gmail.com>