Normalize tests: s/placement [0-9]+/placement xxxxx/g

src/test/regress/bin/normalize.sed

@@ -9,7 +9,7 @@
 # In all tests, normalize worker ports, placement ids, and shard ids
 s/localhost:[0-9]+/localhost:xxxxx/g
 s/ port=[0-9]+ / port=xxxxx /g
-#s/placement [0-9]+/placement xxxxx/g
+s/placement [0-9]+/placement xxxxx/g
 #s/shard [0-9]+/shard xxxxx/g
 #s/assigned task [0-9]+ to node/assigned task to node/
 #s/node group [12] (but|does)/node group \1/

src/test/regress/expected/multi_modifying_xacts.out

@@ -1489,7 +1489,7 @@ SELECT user_id FROM items JOIN itemgroups ON (item_group = gid) WHERE user_id =
 -- because the current implementation of COPY always opens one connection
 -- per placement SELECTs have to use those connections for correctness  
 ALTER TABLE itemgroups ADD COLUMN last_update timestamptz;
-ERROR:  cannot perform DDL on placement 1200036, which has been read over multiple connections
+ERROR:  cannot perform DDL on placement xxxxx, which has been read over multiple connections
 END;
 BEGIN;
 -- establish multiple connections to a node
@@ -1507,7 +1507,7 @@ SELECT user_id FROM items JOIN itemgroups ON (item_group = gid) WHERE user_id =
 
 -- perform a DDL command on a co-located reference table
 ALTER TABLE usergroups ADD COLUMN last_update timestamptz;
-ERROR:  cannot perform DDL on placement 1200034 since a co-located placement has been read over multiple connections
+ERROR:  cannot perform DDL on placement xxxxx since a co-located placement has been read over multiple connections
 END;
 BEGIN;
 -- make a modification over connection 1