Parachain improvements (#1905)

* Parachain improvements

- Set the parachains configuration in Rococo genesis
- Don't stop the overseer when a subsystem job is stopped
- Several small code changes

* Remove unused functionality

* Return error from the runtime instead of printing it

* Apply suggestions from code review

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* Update primitives/src/v1.rs

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* Update primitives/src/v1.rs

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>

* Fix test

* Revert "Update primitives/src/v1.rs"

This reverts commit 11fce2785acd1de481ca57815b8e18400f09fd52.

* Revert "Update primitives/src/v1.rs"

This reverts commit d6439fed4f954360c89fb1e12b73954902c76a41.

* Revert "Return error from the runtime instead of printing it"

This reverts commit cb4b5c0830ac516a6d54b2c24197e9354f2b98cb.

* Revert "Fix test"

This reverts commit 0c5fa1b5566d4cd3c55a55d485e707165ce7a59e.

* Update runtime/parachains/src/runtime_api_impl/v1.rs

Co-authored-by: Sergei Shulepov <sergei@parity.io>

Co-authored-by: Peter Goodspeed-Niklaus <coriolinus@users.noreply.github.com>
Co-authored-by: Sergei Shulepov <sergei@parity.io>

polkadot/node/core/candidate-selection/src/lib.rs

@@ -323,10 +323,7 @@ async fn candidate_is_valid(
 	pov: Arc<PoV>,
 	sender: mpsc::Sender<FromJob>,
 ) -> bool {
-	std::matches!(
-		candidate_is_valid_inner(candidate_descriptor, pov, sender).await,
-		Ok(true)
-	)
+	candidate_is_valid_inner(candidate_descriptor, pov, sender).await.unwrap_or(false)
 }
 
 // find out whether a candidate is valid or not, with a worse interface
@@ -342,7 +339,7 @@ async fn candidate_is_valid_inner(
 			CandidateValidationMessage::ValidateFromChainState(candidate_descriptor, pov, tx),
 		))
 		.await?;
-	Ok(std::matches!(
+	Ok(matches!(
 		rx.await,
 		Ok(Ok(ValidationResult::Valid(_, _)))
 	))