Added a test for acl_roles to test renaming of roles/ usernames

mysql-test/r/acl_roles_rename_user.result

+create user 'test_user'@'localhost';
+create user 'test_role1'@'';
+update mysql.user set is_role='Y' where user='test_role1';
+insert into mysql.roles_mapping (HostFk, UserFk, RoleFk) values ('localhost',
+'test_user',
+'test_role1');
+create user 'test_role2'@'';
+update mysql.user set is_role='Y' where user='test_role2';
+insert into mysql.roles_mapping (HostFk, UserFk, RoleFk) values ('',
+'test_role1',
+'test_role2');
+flush privileges;
+use mysql;
+select * from roles_mapping;
+HostFk	UserFk	RoleFk
+localhost	test_user	test_role1
+	test_role1	test_role2
+rename user 'test_user'@'localhost' to 'test_user_rm'@'newhost';
+select user, host from user where user like 'test%';
+user	host
+test_role1	
+test_role2	
+test_user_rm	newhost
+select * from roles_mapping;
+HostFk	UserFk	RoleFk
+newhost	test_user_rm	test_role1
+	test_role1	test_role2
+rename user 'test_role2'@'' to 'test_role2_rm'@'';
+select user, host from user where user like 'test%';
+user	host
+test_role1	
+test_role2_rm	
+test_user_rm	newhost
+select * from roles_mapping;
+HostFk	UserFk	RoleFk
+newhost	test_user_rm	test_role1
+	test_role1	test_role2_rm
+rename user 'test_role1'@'' to 'test_role1_rm'@'';
+select user, host from user where user like 'test%';
+user	host
+test_role1_rm	
+test_role2_rm	
+test_user_rm	newhost
+select * from roles_mapping;
+HostFk	UserFk	RoleFk
+newhost	test_user_rm	test_role1_rm
+	test_role1_rm	test_role2_rm
+delete from mysql.roles_mapping;
+delete from mysql.user where user like 'test%';
+flush privileges;

mysql-test/t/acl_roles_rename_user.test

+
+#create a user with no privileges
+create user 'test_user'@'localhost';
+create user 'test_role1'@'';
+#manualy create role
+update mysql.user set is_role='Y' where user='test_role1';
+insert into mysql.roles_mapping (HostFk, UserFk, RoleFk) values ('localhost',
+                                                                 'test_user',
+                                                                 'test_role1');
+create user 'test_role2'@'';
+#manualy create role
+update mysql.user set is_role='Y' where user='test_role2';
+insert into mysql.roles_mapping (HostFk, UserFk, RoleFk) values ('',
+                                                                 'test_role1',
+                                                                 'test_role2');
+flush privileges;
+
+use mysql;
+select * from roles_mapping;
+
+#regular user rename
+rename user 'test_user'@'localhost' to 'test_user_rm'@'newhost';
+select user, host from user where user like 'test%';
+select * from roles_mapping;
+
+rename user 'test_role2'@'' to 'test_role2_rm'@'';
+select user, host from user where user like 'test%';
+select * from roles_mapping;
+
+#role rename
+rename user 'test_role1'@'' to 'test_role1_rm'@'';
+select user, host from user where user like 'test%';
+select * from roles_mapping;
+
+delete from mysql.roles_mapping;
+delete from mysql.user where user like 'test%';
+flush privileges;