Update avg() output in binary swap tests

The answerfile was generated against 5X.  A lot has changed in
numeric.c since then, so update answer file accordingly.

src/test/binary_swap/expected/resgroup_current_1_group.out

@@ -18,9 +18,9 @@ select * from pg_resgroup
 select avg(reslimittype)
   from pg_resgroupcapability
   where reslimittype <= 1;
- avg 
------
-   1
+          avg           
+------------------------
+ 1.00000000000000000000
 (1 row)
 
 select groupname from gp_toolkit.gp_resgroup_config

src/test/binary_swap/expected/resgroup_current_1_queue.out

@@ -16,9 +16,9 @@ select * from pg_resgroup
 select avg(reslimittype)
   from pg_resgroupcapability
   where reslimittype <= 1;
- avg 
------
-   1
+          avg           
+------------------------
+ 1.00000000000000000000
 (1 row)
 
 select groupname from gp_toolkit.gp_resgroup_config

src/test/binary_swap/expected/resgroup_current_3_group.out

@@ -18,9 +18,9 @@ select * from pg_resgroup
 select avg(reslimittype)
   from pg_resgroupcapability
   where reslimittype <= 1;
- avg 
------
-   1
+          avg           
+------------------------
+ 1.00000000000000000000
 (1 row)
 
 select groupname from gp_toolkit.gp_resgroup_config

src/test/binary_swap/expected/resgroup_current_3_queue.out

@@ -18,9 +18,9 @@ select * from pg_resgroup
 select avg(reslimittype)
   from pg_resgroupcapability
   where reslimittype <= 1;
- avg 
------
-   1
+          avg           
+------------------------
+ 1.00000000000000000000
 (1 row)
 
 select groupname from gp_toolkit.gp_resgroup_config

src/test/binary_swap/expected/resgroup_other_2_queue.out

@@ -18,9 +18,9 @@ select * from pg_resgroup
 select avg(reslimittype)
   from pg_resgroupcapability
   where reslimittype <= 1;
- avg 
------
-   1
+          avg           
+------------------------
+ 1.00000000000000000000
 (1 row)
 
 select groupname from gp_toolkit.gp_resgroup_config