Service various cleanups (#3238)

* Remove generic from sign()

* Remove mandatory RuntimeGenesis trait req

* Remove requirement from Configuration

* Relax trait bounds of core/cli

* Move method

* The config field is no longer public

* Remove Components from bounds of functions

* Implement DerefMut for LightComponents

* Implement Executor for Full/LightComponents

* Fix bad merge

* Fix forgotten config()

* Fix build

substrate/core/service/src/components.rs

@@ -506,6 +506,16 @@ impl<Factory: ServiceFactory> Future for FullComponents<Factory> {
 	}
 }
 
+impl<Factory: ServiceFactory> Executor<Box<dyn Future<Item = (), Error = ()> + Send>>
+for FullComponents<Factory> {
+	fn execute(
+		&self,
+		future: Box<dyn Future<Item = (), Error = ()> + Send>
+	) -> Result<(), futures::future::ExecuteError<Box<dyn Future<Item = (), Error = ()> + Send>>> {
+		self.service.execute(future)
+	}
+}
+
 impl<Factory: ServiceFactory> Components for FullComponents<Factory> {
 	type Factory = Factory;
 	type Executor = FullExecutor<Factory>;
@@ -606,6 +616,12 @@ impl<Factory: ServiceFactory> Deref for LightComponents<Factory> {
 	}
 }
 
+impl<Factory: ServiceFactory> DerefMut for LightComponents<Factory> {
+	fn deref_mut(&mut self) -> &mut Self::Target {
+		&mut self.service
+	}
+}
+
 impl<Factory: ServiceFactory> Future for LightComponents<Factory> {
 	type Item = ();
 	type Error = ();
@@ -615,6 +631,16 @@ impl<Factory: ServiceFactory> Future for LightComponents<Factory> {
 	}
 }
 
+impl<Factory: ServiceFactory> Executor<Box<dyn Future<Item = (), Error = ()> + Send>>
+for LightComponents<Factory> {
+	fn execute(
+		&self,
+		future: Box<dyn Future<Item = (), Error = ()> + Send>
+	) -> Result<(), futures::future::ExecuteError<Box<dyn Future<Item = (), Error = ()> + Send>>> {
+		self.service.execute(future)
+	}
+}
+
 impl<Factory: ServiceFactory> Components for LightComponents<Factory> {
 	type Factory = Factory;
 	type Executor = LightExecutor<Factory>;