updated mysql install process

post_install.sh

@@ -82,7 +82,7 @@ else
 
 # Configure mysql
 mysql -u root <<-EOF
-UPDATE mysql.user SET Password=PASSWORD('${PASS}') WHERE User='root';
+ALTER USER 'root'@'localhost' IDENTIFIED BY '${PASS}';
 DELETE FROM mysql.user WHERE User='root' AND Host NOT IN ('localhost', '127.0.0.1', '::1');
 DELETE FROM mysql.user WHERE User='';
 DELETE FROM mysql.db WHERE Db='test' OR Db='test_%';