Remove the dapps system (#9017)

* Remove the dapps system from Parity

* Move node-health outside of dapps

* Fix set dapps list test

* Update Cargo.lock

* Deprecate options

* Add _legacy_ prefixes in Dapps

* Fix tests

* Fix deprecatedness of dapps-path

rpc/src/tests/rpc.rs

@@ -26,19 +26,19 @@ fn serve(handler: Option<MetaIoHandler<Metadata>>) -> Server<HttpServer> {
 	let address = "127.0.0.1:0".parse().unwrap();
 	let handler = handler.unwrap_or_default();
 
-	Server::new(|remote| ::start_http(
+	Server::new(|remote| ::start_http_with_middleware(
 		&address,
 		http::DomainsValidation::Disabled,
 		http::DomainsValidation::Disabled,
 		handler,
 		remote,
 		extractors::RpcExtractor,
-		Some(|request: hyper::Request| {
+		|request: hyper::Request| {
 			http::RequestMiddlewareAction::Proceed {
 				should_continue_on_invalid_cors: false,
 				request,
 			}
-		}),
+		},
 		1,
 		5,
 	).unwrap())