Don't leave roles behind after core regression tests.

Commits cf5eb37c5 and e5b8a4c09 each created a new role that they
forgot to remove again.  This breaks the use-case of running "make
installcheck" more than once, and it's also against project policy
because it'd be quite unfriendly behavior if one were running
"make installcheck" against a non-throwaway installation.

src/test/regress/expected/create_role.out

@@ -174,18 +174,23 @@ DROP ROLE regress_password_null;
 DROP ROLE regress_noiseword;
 DROP ROLE regress_inroles;
 DROP ROLE regress_adminroles;
--- fail, cannot drop ourself nor superusers
+-- fail, cannot drop ourself, nor superusers or roles we lack ADMIN for
 DROP ROLE regress_role_super;
 ERROR:  must be superuser to drop superusers
 DROP ROLE regress_role_admin;
 ERROR:  current user cannot be dropped
+DROP ROLE regress_rolecreator;
+ERROR:  must have admin option on role "regress_rolecreator"
 -- ok
 RESET SESSION AUTHORIZATION;
 REVOKE CREATE ON DATABASE regression FROM regress_role_admin CASCADE;
 DROP INDEX tenant_idx;
 DROP TABLE tenant_table;
 DROP VIEW tenant_view;
+DROP SCHEMA regress_tenant2_schema;
 DROP ROLE regress_tenant;
+DROP ROLE regress_tenant2;
+DROP ROLE regress_rolecreator;
 DROP ROLE regress_role_admin;
 DROP ROLE regress_role_super;
 DROP ROLE regress_role_normal;

src/test/regress/sql/create_role.sql

@@ -161,9 +161,10 @@ DROP ROLE regress_noiseword;
 DROP ROLE regress_inroles;
 DROP ROLE regress_adminroles;
 
--- fail, cannot drop ourself nor superusers
+-- fail, cannot drop ourself, nor superusers or roles we lack ADMIN for
 DROP ROLE regress_role_super;
 DROP ROLE regress_role_admin;
+DROP ROLE regress_rolecreator;
 
 -- ok
 RESET SESSION AUTHORIZATION;
@@ -171,7 +172,10 @@ REVOKE CREATE ON DATABASE regression FROM regress_role_admin CASCADE;
 DROP INDEX tenant_idx;
 DROP TABLE tenant_table;
 DROP VIEW tenant_view;
+DROP SCHEMA regress_tenant2_schema;
 DROP ROLE regress_tenant;
+DROP ROLE regress_tenant2;
+DROP ROLE regress_rolecreator;
 DROP ROLE regress_role_admin;
 DROP ROLE regress_role_super;
 DROP ROLE regress_role_normal;