Backporing to 1.4.10-stable (#4110)

* v1.4.10

* No reorg limit for ancient blocks

* Update registration after every write


Former-commit-id: 9480d724d04ecaa1fdccc7d9bb56ba8b3580ccf1

util/network/src/connection.rs

@@ -158,8 +158,8 @@ impl<Socket: GenericSocket> GenericConnection<Socket> {
 			}
 			if self.send_queue.is_empty() {
 				self.interest.remove(Ready::writable());
-				try!(io.update_registration(self.token));
 			}
+			try!(io.update_registration(self.token));
 			Ok(r)
 		})
 	}