Getting configuration from commands (#4643)

* Expose a method that allows converting RunCmd to Configuration

* WIP

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substrate/bin/node/cli/src/cli.rs

@@ -138,6 +138,7 @@ pub fn run<I, T, E>(args: I, exit: E, version: sc_cli::VersionInfo) -> error::Re
 				load_spec,
 				&cli_args.shared_params,
 				&version,
+				None,
 			)?;
 			sc_cli::fill_import_params(&mut config, &cli_args.import_params, ServiceRoles::FULL)?;