Fixes isolation tests

src/test/regress/expected/isolation_enable_ddl_propagation.out

@@ -1,11 +1,12 @@
 Parsed test spec with 1 sessions
 
 starting permutation: s1-begin s1-commit
-run_command_on_workers
+result
 ---------------------------------------------------------------------
-(localhost,57637,t,t)
-(localhost,57638,t,t)
-(2 rows)
+t
+t
+t
+(3 rows)
 
 step s1-begin:
  BEGIN;

src/test/regress/expected/isolation_enable_ddl_propagation_0.out

@@ -0,0 +1,14 @@
+Parsed test spec with 1 sessions
+
+starting permutation: s1-begin s1-commit
+result
+---------------------------------------------------------------------
+t
+(1 row)
+
+step s1-begin:
+ BEGIN;
+
+step s1-commit:
+ COMMIT;
+

src/test/regress/isolation_schedule

@@ -1,3 +1,4 @@
+test: isolation_enable_ddl_propagation
 test: isolation_setup
 test: isolation_add_remove_node
 test: isolation_update_node

src/test/regress/spec/isolation_enable_ddl_propagation.spec

@@ -1,7 +1,7 @@
 setup
 {
-	SELECT run_command_on_workers('ALTER SYSTEM SET citus.enable_ddl_propagation TO ON');
-	SELECT run_command_on_workers('SELECT pg_reload_conf()');
+	SELECT result from run_command_on_all_nodes('ALTER SYSTEM SET citus.enable_ddl_propagation TO ON');
+	SELECT result from run_command_on_all_nodes('SELECT pg_reload_conf()');
 }
 
 session "s1"