openstack i版本 单用户模式（rhel5、rhel6)
1、获取vnc地址nova get-vnc-console 78115662-3c7a-4d32-93db-c19d3ace8609 novnc
+-------+-------------------------------------------------------------------------------------+
| Type| Url |
+-------+-------------------------------------------------------------------------------------+
| novnc | http://10.197.129.160:6080/vnc_auto.html?token=02542c64-ebb8-4660-8f55-6cdabd817879 |
+-------+-------------------------------------------------------------------------------------+
2、重启云主机
nova stop 78115662-3c7a-4d32-93db-c19d3ace8609
nova start 78115662-3c7a-4d32-93db-c19d3ace8609
3、刷新vnc页面
4、按e键在vnc页面中进行boot编辑状态
5、将console=tty0及其后面的全部删除，替换成1或single,后按enter键，再按b键启动即可
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