ZEPPELIN-3174. ZeppelinSparkClusterTest fails when using hadoop3 and jdk7
ZEPPELIN-3174. ZeppelinSparkClusterTest fails when using hadoop3 and jdk7

### What is this PR for?
Trivial change to make travis pass

### What type of PR is it?
[Bug Fix]

### Todos
* [ ] - Task

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-3174

### How should this be tested?
* Travis pass

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: Jeff Zhang <zjffdu@apache.org>

Closes #2734 from zjffdu/ZEPPELIN-3174 and squashes the following commits:

d1c8a68 [Jeff Zhang] ZEPPELIN-3174. ZeppelinSparkClusterTest fails when using hadoop3 and jdk7

karuppayya/zeppelin,tinkoff-dwh/zeppelin,jongyoul/incubator-zeppelin,tinkoff-dwh/zeppelin,cquptEthan/incubator-zeppelin,herval/zeppelin,jongyoul/incubator-zeppelin,zjffdu/zeppelin,jongyoul/incubator-zeppelin,Leemoonsoo/zeppelin,lresende/incubator-zeppelin,hammertank/zeppelin,apache/incubator-zeppelin,zetaris/zeppelin,VipinRathor/zeppelin,fogbeam/zeppelin_mirror,tzolov/incubator-zeppelin,pellmont/zeppelin,Leemoonsoo/zeppelin,herval/zeppelin,r-kamath/zeppelin,apache/incubator-zeppelin,fogbeam/zeppelin_mirror,fogbeam/zeppelin_mirror,prabhjyotsingh/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,r-kamath/incubator-zeppelin,r-kamath/zeppelin,prabhjyotsingh/zeppelin,sergeymazin/zeppelin,pellmont/zeppelin,tzolov/incubator-zeppelin,cquptEthan/incubator-zeppelin,mwkang/zeppelin,zetaris/zeppelin,VipinRathor/zeppelin,hammertank/zeppelin,jongyoul/zeppelin,sergeymazin/zeppelin,jongyoul/zeppelin,pellmont/zeppelin,mwkang/zeppelin,herval/zeppelin,prabhjyotsingh/zeppelin,lresende/incubator-zeppelin,herval/zeppelin,pellmont/zeppelin,prabhjyotsingh/incubator-zeppelin,r-kamath/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,datalayer/zeppelin-datalayer,apache/incubator-zeppelin,hammertank/zeppelin,joroKr21/incubator-zeppelin,cquptEthan/incubator-zeppelin,herval/zeppelin,VipinRathor/zeppelin,cquptEthan/incubator-zeppelin,jongyoul/zeppelin,jongyoul/zeppelin,Leemoonsoo/incubator-zeppelin,zetaris/zeppelin,fogbeam/zeppelin_mirror,sergeymazin/zeppelin,jongyoul/zeppelin,zjffdu/zeppelin,apache/zeppelin,hammertank/zeppelin,apache/incubator-zeppelin,apache/incubator-zeppelin,tinkoff-dwh/zeppelin,r-kamath/zeppelin,karuppayya/zeppelin,cquptEthan/incubator-zeppelin,herval/zeppelin,datalayer/zeppelin-datalayer,joroKr21/incubator-zeppelin,VipinRathor/zeppelin,pellmont/zeppelin,apache/zeppelin,jongyoul/incubator-zeppelin,cquptEthan/incubator-zeppelin,lresende/incubator-zeppelin,Leemoonsoo/zeppelin,joroKr21/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,sergeymazin/zeppelin,lresende/incubator-zeppelin,mwkang/zeppelin,sergeymazin/zeppelin,fogbeam/zeppelin_mirror,fogbeam/zeppelin_mirror,zjffdu/zeppelin,karuppayya/zeppelin,anthonycorbacho/incubator-zeppelin,sergeymazin/zeppelin,lresende/incubator-zeppelin,apache/zeppelin,r-kamath/incubator-zeppelin,r-kamath/incubator-zeppelin,joroKr21/incubator-zeppelin,tinkoff-dwh/zeppelin,Leemoonsoo/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,jongyoul/incubator-zeppelin,r-kamath/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,VipinRathor/zeppelin,joroKr21/incubator-zeppelin,fogbeam/zeppelin_mirror,prabhjyotsingh/zeppelin,anthonycorbacho/incubator-zeppelin,pellmont/zeppelin,zetaris/zeppelin,joroKr21/incubator-zeppelin,mwkang/zeppelin,tzolov/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,VipinRathor/zeppelin,hammertank/zeppelin,r-kamath/zeppelin,r-kamath/incubator-zeppelin,zjffdu/zeppelin,Leemoonsoo/zeppelin,tinkoff-dwh/zeppelin,zjffdu/zeppelin,r-kamath/incubator-zeppelin,joroKr21/incubator-zeppelin,karuppayya/zeppelin,karuppayya/zeppelin,apache/zeppelin,datalayer/zeppelin-datalayer,herval/zeppelin,zetaris/zeppelin,prabhjyotsingh/zeppelin,mwkang/zeppelin,cquptEthan/incubator-zeppelin,joroKr21/incubator-zeppelin,zetaris/zeppelin,lresende/incubator-zeppelin,Leemoonsoo/zeppelin,Leemoonsoo/zeppelin,VipinRathor/zeppelin,mwkang/zeppelin,prabhjyotsingh/zeppelin,apache/zeppelin,karuppayya/zeppelin,Leemoonsoo/zeppelin,anthonycorbacho/incubator-zeppelin,lresende/incubator-zeppelin,zjffdu/zeppelin,tzolov/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,tinkoff-dwh/zeppelin,datalayer/zeppelin-datalayer,tzolov/incubator-zeppelin,mwkang/zeppelin,prabhjyotsingh/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,zjffdu/zeppelin,sergeymazin/zeppelin,apache/incubator-zeppelin,r-kamath/zeppelin,prabhjyotsingh/zeppelin,zetaris/zeppelin,Leemoonsoo/incubator-zeppelin,Leemoonsoo/zeppelin,hammertank/zeppelin,pellmont/zeppelin,anthonycorbacho/incubator-zeppelin,jongyoul/zeppelin,tinkoff-dwh/zeppelin,apache/zeppelin,jongyoul/zeppelin,tzolov/incubator-zeppelin,r-kamath/zeppelin,jongyoul/incubator-zeppelin,hammertank/zeppelin,r-kamath/zeppelin,prabhjyotsingh/zeppelin,karuppayya/zeppelin,anthonycorbacho/incubator-zeppelin,apache/zeppelin