Implement runtime version checks in set_code (#4548)

* Implement runtime version checks in `set_code`

Check that the new runtime code given to `set_code` fullfills some
requirements:

- `spec_name` matches
- `spec_version` does not decreases
- `impl_version` does not decreases
- Either `spec_version` and `impl_version` increase

* Make tests almost work

* Some fixes after master merge

* Fix tests

* Add missed file

* Make depedency check happy?

* Remove leftover `sc-executor`

* AHHHHH

* Reset debug stuff

* Remove some 'static

* More 'static

* Some docs

* Update `Cargo.lock`

substrate/client/finality-grandpa/src/observer.rs

@@ -67,7 +67,7 @@ fn grandpa_observer<B, E, Block: BlockT, RA, S, F>(
 ) -> impl Future<Item=(), Error=CommandOrError<Block::Hash, NumberFor<Block>>> where
 	NumberFor<Block>: BlockNumberOps,
 	B: Backend<Block>,
-	E: CallExecutor<Block> + Send + Sync,
+	E: CallExecutor<Block> + Send + Sync + 'static,
 	RA: Send + Sync,
 	S: Stream<
 		Item = CommunicationIn<Block>,