Die error_chain, die (#10747)

* Replace error chain for network error

* Fix usages and add manual From impls

* OnDemand Error and remove remaining dependencies

* Die error_chain, die.

* DIE

* Hasta la vista, baby

parity/configuration.rs

@@ -710,7 +710,7 @@ impl Configuration {
 				for line in &lines {
 					match validate_node_url(line).map(Into::into) {
 						None => continue,
-						Some(sync::ErrorKind::AddressResolve(_)) => return Err(format!("Failed to resolve hostname of a boot node: {}", line)),
+						Some(sync::Error::AddressResolve(_)) => return Err(format!("Failed to resolve hostname of a boot node: {}", line)),
 						Some(_) => return Err(format!("Invalid node address format given for a boot node: {}", line)),
 					}
 				}

parity/helpers.rs

@@ -186,7 +186,7 @@ pub fn to_bootnodes(bootnodes: &Option<String>) -> Result<Vec<String>, String> {
 		Some(ref x) if !x.is_empty() => x.split(',').map(|s| {
 			match validate_node_url(s).map(Into::into) {
 				None => Ok(s.to_owned()),
-				Some(sync::ErrorKind::AddressResolve(_)) => Err(format!("Failed to resolve hostname of a boot node: {}", s)),
+				Some(sync::Error::AddressResolve(_)) => Err(format!("Failed to resolve hostname of a boot node: {}", s)),
 				Some(_) => Err(format!("Invalid node address format given for a boot node: {}", s)),
 			}
 		}).collect(),