fix mysql_upgrade to preserve the collation of mysql.user.is_role

mysql-test/r/system_mysql_db_fix40123.result

@@ -125,7 +125,7 @@ user	CREATE TABLE `user` (
   `max_updates` int(11) unsigned NOT NULL DEFAULT '0',
   `max_connections` int(11) unsigned NOT NULL DEFAULT '0',
   `max_user_connections` int(11) NOT NULL DEFAULT '0',
-  `is_role` enum('N','Y') COLLATE utf8_bin NOT NULL DEFAULT 'N',
+  `is_role` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
   `plugin` char(64) CHARACTER SET latin1 NOT NULL DEFAULT '',
   `authentication_string` text COLLATE utf8_bin NOT NULL,
   PRIMARY KEY (`Host`,`User`)

mysql-test/r/system_mysql_db_fix50030.result

@@ -125,7 +125,7 @@ user	CREATE TABLE `user` (
   `max_updates` int(11) unsigned NOT NULL DEFAULT '0',
   `max_connections` int(11) unsigned NOT NULL DEFAULT '0',
   `max_user_connections` int(11) NOT NULL DEFAULT '0',
-  `is_role` enum('N','Y') COLLATE utf8_bin NOT NULL DEFAULT 'N',
+  `is_role` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
   `plugin` char(64) CHARACTER SET latin1 NOT NULL DEFAULT '',
   `authentication_string` text COLLATE utf8_bin NOT NULL,
   PRIMARY KEY (`Host`,`User`)

mysql-test/r/system_mysql_db_fix50117.result

@@ -125,7 +125,7 @@ user	CREATE TABLE `user` (
   `max_updates` int(11) unsigned NOT NULL DEFAULT '0',
   `max_connections` int(11) unsigned NOT NULL DEFAULT '0',
   `max_user_connections` int(11) NOT NULL DEFAULT '0',
-  `is_role` enum('N','Y') COLLATE utf8_bin NOT NULL DEFAULT 'N',
+  `is_role` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
   `plugin` char(64) CHARACTER SET latin1 NOT NULL DEFAULT '',
   `authentication_string` text COLLATE utf8_bin NOT NULL,
   PRIMARY KEY (`Host`,`User`)

scripts/mysql_system_tables_fix.sql

@@ -188,7 +188,8 @@ ALTER TABLE user
   MODIFY Execute_priv enum('N','Y') COLLATE utf8_general_ci DEFAULT 'N' NOT NULL,
   MODIFY Repl_slave_priv enum('N','Y') COLLATE utf8_general_ci DEFAULT 'N' NOT NULL,
   MODIFY Repl_client_priv enum('N','Y') COLLATE utf8_general_ci DEFAULT 'N' NOT NULL,
-  MODIFY ssl_type enum('','ANY','X509', 'SPECIFIED') COLLATE utf8_general_ci DEFAULT '' NOT NULL;
+  MODIFY ssl_type enum('','ANY','X509', 'SPECIFIED') COLLATE utf8_general_ci DEFAULT '' NOT NULL,
+  MODIFY is_role enum('N', 'Y') COLLATE utf8_general_ci DEFAULT 'N' NOT NULL;
 
 ALTER TABLE db
   MODIFY Host char(60) NOT NULL default '',