[2.x.x] Use blocking IO in P2P to reduce CPU load (#2855)

* Use blocking IO in P2P to reduce CPU load

util/src/lib.rs

@@ -47,9 +47,6 @@ pub use crate::types::{LogLevel, LoggingConfig, ZeroingString};
 
 pub mod macros;
 
-// read_exact and write_all impls
-pub mod read_write;
-
 // other utils
 #[allow(unused_imports)]
 use std::ops::Deref;