Handle socket address parsing errors (#8545)

Unpack errors and check for io::ErrorKind::InvalidInput and return our own AddressParse error. Remove the foreign link to std::net::AddrParseError and add an `impl From` for that error. Test parsing properly.

util/network-devp2p/src/lib.rs

@@ -95,6 +95,8 @@ extern crate serde_derive;
 
 #[cfg(test)]
 extern crate tempdir;
+#[cfg(test)] #[macro_use]
+extern crate assert_matches;
 
 mod host;
 mod connection;