MDEV-11069 main.information_schema test fails if hostname includes 'user'

Patch provided by Honza Horak

mysql-test/r/information_schema.result

@@ -986,19 +986,19 @@ show grants;
 Grants for user3@localhost
 GRANT USAGE ON *.* TO 'user3'@'localhost'
 GRANT SELECT ON `mysqltest`.* TO 'user3'@'localhost'
-select * from information_schema.column_privileges where grantee like '%user%'
+select * from information_schema.column_privileges where grantee like '\'user%'
 order by grantee;
 GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
 'user1'@'localhost'	def	mysqltest	t1	f1	SELECT	NO
-select * from information_schema.table_privileges where grantee like '%user%'
+select * from information_schema.table_privileges where grantee like '\'user%'
 order by grantee;
 GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	PRIVILEGE_TYPE	IS_GRANTABLE
 'user2'@'localhost'	def	mysqltest	t2	SELECT	NO
-select * from information_schema.schema_privileges where grantee like '%user%'
+select * from information_schema.schema_privileges where grantee like '\'user%'
 order by grantee;
 GRANTEE	TABLE_CATALOG	TABLE_SCHEMA	PRIVILEGE_TYPE	IS_GRANTABLE
 'user3'@'localhost'	def	mysqltest	SELECT	NO
-select * from information_schema.user_privileges where grantee like '%user%'
+select * from information_schema.user_privileges where grantee like '\'user%'
 order by grantee;
 GRANTEE	TABLE_CATALOG	PRIVILEGE_TYPE	IS_GRANTABLE
 'user1'@'localhost'	def	USAGE	NO

mysql-test/t/information_schema.test

@@ -612,13 +612,13 @@ select * from information_schema.schema_privileges order by grantee;
 select * from information_schema.user_privileges order by grantee;
 show grants;
 connection con4;
-select * from information_schema.column_privileges where grantee like '%user%'
+select * from information_schema.column_privileges where grantee like '\'user%'
 order by grantee;
-select * from information_schema.table_privileges where grantee like '%user%'
+select * from information_schema.table_privileges where grantee like '\'user%'
 order by grantee;
-select * from information_schema.schema_privileges where grantee like '%user%'
+select * from information_schema.schema_privileges where grantee like '\'user%'
 order by grantee;
-select * from information_schema.user_privileges where grantee like '%user%'
+select * from information_schema.user_privileges where grantee like '\'user%'
 order by grantee;
 show grants;
 connection default;