Remove pointless ignore regex and fix tests

This ignore regex was simply hiding the fact that one expected test
output was broken. Remove the ignore and fix the test.

src/test/regress/atmsort.pm

@@ -410,9 +410,6 @@ m/^HINT:  The \'DISTRIBUTED BY\' clause determines the distribution of data/
 
 m/^WARNING:  Referential integrity \(.*\) constraints are not supported in Greenplum Database/
 
-
-m/^\s*Distributed by:\s+\(.*\)\s*$/
-
         # ignore notices for DROP sqlobject IF EXISTS "objectname"
         # eg NOTICE:  table "foo" does not exist, skipping
         #

src/test/regress/expected/create_index.out

@@ -444,7 +444,7 @@ Indexes:
     "concur_index5" btree (f2) WHERE f1 = 'x'::text
     "concur_index6" btree ((f2 || f1))
     "std_index" btree (f2)
-Distributed by: (f1)
+Distributed by: (dk)
 
 DROP TABLE concur_heap;
 --