Why isn't the restart button functioning properly?

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这是PR的目的？启用Shiro认证或切换到用户隔离模式（选项）测试流程：执行简单代码如`sc.version`，点击重启按钮。

WhatisthisPRfor?WhenIenableauthenticationwith

What is this PR for?

When I enable authentication with

1shiro

or switch interpreter mode to

1Per user & isolated

,

1Restart

does not work and it is possible to make zombie process.

• Environment:OS: CentOS 6Zeppelin: master, branch-0.7Configuration: Enable authentication with

  1shiro

  Set interpreter mode to

  1Per user & isolated

  (Option)

• Test flow:

  

• Execute simple code such as1sc.version
• Click "Restart" button
• Execute simple code again
• Shutdown zeppelin
• Monitor java processes