Completely remove epoll crate dependency

Move epoll.rs from polly to utils crate and use this file,
in micro_http, as an epoll wrapper instead of the epoll crate.

Signed-off-by: Laura Loghin <lauralg@amazon.com>
Signed-off-by: YUAN LYU <lyuyuan92@gmail.com>

src/lib.rs

@@ -109,6 +109,8 @@
 //! }
 //! ```
 
+extern crate utils;
+
 mod common;
 mod connection;
 mod request;