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

@@ -222,8 +222,21 @@ pub fn check_validation_outputs<T: initializer::Trait>(
 	para_id: ParaId,
 	outputs: primitives::v1::ValidationOutputs,
 ) -> bool {
-	// we strip detailed information from error here for the sake of simplicity of runtime API.
-	<inclusion::Module<T>>::check_validation_outputs(para_id, outputs).is_ok()
+	match <inclusion::Module<T>>::check_validation_outputs(para_id, outputs) {
+		Ok(()) => true,
+		Err(e) => {
+			frame_support::debug::RuntimeLogger::init();
+			let err: &'static str = e.into();
+			log::debug!(
+				target: "candidate_validation",
+				"Validation outputs checking for parachain `{}` failed: {}",
+				u32::from(para_id),
+				err,
+			);
+
+			false
+		}
+	}
 }
 
 /// Implementation for the `session_index_for_child` function of the runtime API.