silence some parachain warnings (#2859)

* silence some parachain warnings

* that was actually a bug that Rob is fixing

polkadot/node/core/approval-voting/src/import.rs

@@ -212,7 +212,7 @@ async fn load_all_sessions(
 		let session_info = match rx.await {
 			Ok(Ok(Some(s))) => s,
 			Ok(Ok(None)) => {
-				tracing::warn!(
+				tracing::debug!(
 					target: LOG_TARGET,
 					"Session {} is missing from session-info state of block {}",
 					i,
@@ -266,14 +266,14 @@ async fn cache_session_info_for_head(
 
 			let window_start = session_index.saturating_sub(APPROVAL_SESSIONS - 1);
 
-			tracing::info!(
+			tracing::debug!(
 				target: LOG_TARGET, "Loading approval window from session {}..={}",
 				window_start, session_index,
 			);
 
 			match load_all_sessions(ctx, block_hash, window_start, session_index).await {
 				Err(SessionsUnavailable) => {
-					tracing::warn!(
+					tracing::debug!(
 						target: LOG_TARGET,
 						"Could not load sessions {}..={} from block {:?} in session {}",
 						window_start, session_index, block_hash, session_index,
@@ -599,7 +599,7 @@ pub(crate) async fn handle_new_head(
 			&header,
 		).await
 	{
-		tracing::warn!(
+		tracing::debug!(
 			target: LOG_TARGET,
 			"Could not cache session info when processing head {:?}",
 			head,