Fix answer file of test sql/resgroup/resgroup_unassign_entrydb

ci pipeline uses two segment nodes for resgroup testing which is different than
ususal three segment node test configuration. Modifying the test to make it
independent of segment numbers.

src/test/isolation2/expected/resgroup/resgroup_unassign_entrydb.out

@@ -86,13 +86,11 @@ server closed the connection unexpectedly
 -- Verify the system is ok with entrydb.
 2: SET ROLE role_test;
 SET
-2: SELECT * from gp_dist_random('gp_id'), pg_sleep(0.1);
+2: SELECT * from gp_dist_random('gp_id'), pg_sleep(0.1) LIMIT 1;
  gpname    | numsegments | dbid | content | pg_sleep 
 -----------+-------------+------+---------+----------
  Greenplum | -1          | -1   | -1      |          
- Greenplum | -1          | -1   | -1      |          
- Greenplum | -1          | -1   | -1      |          
-(3 rows)
+(1 row)
 2q: ... <quitting>
 
 -- Clean up

src/test/isolation2/sql/resgroup/resgroup_unassign_entrydb.sql

@@ -42,7 +42,7 @@ SELECT gp_inject_fault('unassign_resgroup_start_entrydb', 'reset', 1);
 
 -- Verify the system is ok with entrydb.
 2: SET ROLE role_test;
-2: SELECT * from gp_dist_random('gp_id'), pg_sleep(0.1);
+2: SELECT * from gp_dist_random('gp_id'), pg_sleep(0.1) LIMIT 1;
 2q:
 
 -- Clean up