chore: enable full CI run (#1399)

* update all tests
* fix doc examples
* misc API tweaks

tokio-tls/examples/echo.rs

@@ -1,60 +0,0 @@
-#![deny(warnings, rust_2018_idioms)]
-
-// A tiny async TLS echo server with Tokio
-use native_tls;
-use native_tls::Identity;
-use tokio;
-use tokio::io;
-use tokio::net::TcpListener;
-use tokio::prelude::*;
-use tokio_tls;
-
-fn main() -> Result<(), Box<dyn std::error::Error>> {
-    // Bind the server's socket
-    let addr = "127.0.0.1:12345".parse()?;
-    let tcp = TcpListener::bind(&addr)?;
-
-    // Create the TLS acceptor.
-    let der = include_bytes!("identity.p12");
-    let cert = Identity::from_pkcs12(der, "mypass")?;
-    let tls_acceptor =
-        tokio_tls::TlsAcceptor::from(native_tls::TlsAcceptor::builder(cert).build()?);
-
-    // Iterate incoming connections
-    let server = tcp
-        .incoming()
-        .for_each(move |tcp| {
-            // Accept the TLS connection.
-            let tls_accept = tls_acceptor
-                .accept(tcp)
-                .and_then(move |tls| {
-                    // Split up the read and write halves
-                    let (reader, writer) = tls.split();
-
-                    // Copy the data back to the client
-                    let conn = io::copy(reader, writer)
-                        // print what happened
-                        .map(|(n, _, _)| println!("wrote {} bytes", n))
-                        // Handle any errors
-                        .map_err(|err| println!("IO error {:?}", err));
-
-                    // Spawn the future as a concurrent task
-                    tokio::spawn(conn);
-
-                    Ok(())
-                })
-                .map_err(|err| {
-                    println!("TLS accept error: {:?}", err);
-                });
-            tokio::spawn(tls_accept);
-
-            Ok(())
-        })
-        .map_err(|err| {
-            println!("server error {:?}", err);
-        });
-
-    // Start the runtime and spin up the server
-    tokio::run(server);
-    Ok(())
-}