Normalize a debug failure to WARNING failure (#4996)

src/test/regress/bin/normalize.sed

@@ -65,6 +65,9 @@ s/"(raw_events_second_user_id_value_1_key_|agg_events_user_id_value_1_agg_key_)[
 # ignore WAL warnings
 /DEBUG: .+creating and filling new WAL file/d
 
+# normalize debug connection failure
+s/DEBUG:  connection to the remote node/WARNING:  connection to the remote node/g
+
 # normalize file names for partitioned files
 s/(task_[0-9]+\.)[0-9]+/\1xxxx/g
 s/(job_[0-9]+\/task_[0-9]+\/p_[0-9]+\.)[0-9]+/\1xxxx/g

src/test/regress/expected/failure_distributed_results.out

@@ -86,7 +86,7 @@ CREATE TABLE distributed_result_info AS
   SELECT resultId, nodeport, rowcount, targetShardId, targetShardIndex
   FROM partition_task_list_results('test', $$ SELECT * FROM source_table $$, 'target_table')
           NATURAL JOIN pg_dist_node;
-DEBUG:  connection to the remote node localhost:xxxxx failed with the following error: server closed the connection unexpectedly
+WARNING:  connection to the remote node localhost:xxxxx failed with the following error: server closed the connection unexpectedly
 	This probably means the server terminated abnormally
 	before or while processing the request.
 SELECT * FROM distributed_result_info ORDER BY resultId;