[ZEPPELIN-4962]. Support for manually specifying the Java version of Spark Interpreter Scala REPL and fix the CI failure due to low Scala version

### What is this PR for?
- fix the [CI failure](https://travis-ci.org/github/apache/zeppelin/builds/709913046) due to [PR-3852](apache#3852)

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

### Todos
* [ ] - Task

### What is the Jira issue?
* [ZEPPELIN-4962](https://issues.apache.org/jira/projects/ZEPPELIN/issues/ZEPPELIN-4962)

### How should this be tested?
* CI test

### Screenshots (if appropriate)

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

Author: xiejiajun <xiejiajun02@163.com>
Author: xie-jia-jun <xiejiajun02@163.com>
Author: JakeXie <xiejiajun02@163.com>

Closes apache#3860 from xiejiajun/ZEPPELIN-4962 and squashes the following commits:

9128c9b [JakeXie] spark.repl.target docs update
ad4c0e3 [xiejiajun] Clear irrelevant code
a12d3a9 [xiejiajun] Support for manually specifying the Java version of Spark Interpreter Scala REPL and fix the CI failure due to low Scala version
ab2b191 [xiejiajun] Merge branch 'master' of https://github.com/apache/zeppelin into apache-master
5569788 [xiejiajun] Merge branch 'master' of https://github.com/apache/zeppelin into apache-master
0a9af6c [xiejiajun] Merge branch 'master' of https://github.com/apache/zeppelin into apache-master
be36b37 [xiejiajun] 合并Apache Master分支冲突解决
1335d55 [xiejiajun] Merge remote-tracking branch 'origin/master'
fc59f57 [JakeXie] Merge pull request apache#4 from apache/master
9cc70fe [xiejiajun] Merge remote-tracking branch 'origin/master'
6ef9b23 [xie-jia-jun] Merge pull request apache#3 from apache/master
45af87a [xiejiajun] added timeout for getting Thrift client to avoid situations where the interpreter may not be restarted when the interpreter process exits unexpectedly
f149c3b [xie-jia-jun] Merge pull request #1 from apache/master
5d4b645 [xie-jia-jun] Support OSSConfigStorage of Aliyun
dbb6639 [xie-jia-jun] Add Aliyun OSS SDK
bb47849 [xie-jia-jun] Support S3ConfigStorage of AWS

Author: xiejiajun

docs/interpreter/spark.md

@@ -200,10 +200,21 @@ You can also set other Spark properties which are not listed in the table. For a
       (ex: http://{{PORT}}-{{SERVICE_NAME}}.{{SERVICE_DOMAIN}})
      </td>
   </tr>
-  <td>spark.webui.yarn.useProxy</td>
+  <tr>
+    <td>spark.webui.yarn.useProxy</td>
     <td>false</td>
     <td>whether use yarn proxy url as spark weburl, e.g. http://localhost:8088/proxy/application_1583396598068_0004</td>
   </tr>
+  <tr>
+    <td>spark.repl.target</td>
+    <td>jvm-1.6</td>
+    <td>
+      Manually specifying the Java version of Spark Interpreter Scala REPL,Available options:<br/> 
+      scala-compile v2.10.7 to v2.11.12 supports "jvm-1.5, jvm-1.6, jvm-1.7 and jvm-1.8", and the default value is jvm-1.6.<br/> 
+      scala-compile v2.10.1 to v2.10.6 supports "jvm-1.5, jvm-1.6, jvm-1.7", and the default value is jvm-1.6.<br/> 
+      scala-compile v2.12.x defaults to jvm-1.8, and only supports jvm-1.8.
+    </td>
+  </tr>
 </table>
 
 Without any configuration, Spark interpreter works out of box in local mode. But if you want to connect to your Spark cluster, you'll need to follow below two simple steps.

spark/scala-2.10/src/main/scala/org/apache/zeppelin/spark/SparkScala210Interpreter.scala

@@ -67,10 +67,13 @@ class SparkScala210Interpreter(override val conf: SparkConf,
       sparkHttpServer = server
       conf.set("spark.repl.class.uri", uri)
     }
+    val target = conf.get("spark.repl.target", "jvm-1.6")
 
     val settings = new Settings()
     settings.embeddedDefaults(sparkInterpreterClassLoader)
     settings.usejavacp.value = true
+    settings.target.value = target
+
     this.userJars = getUserJars()
     LOGGER.info("UserJars: " + userJars.mkString(File.pathSeparator))
     settings.classpath.value = userJars.mkString(File.pathSeparator)

spark/scala-2.11/src/main/scala/org/apache/zeppelin/spark/SparkScala211Interpreter.scala

@@ -66,12 +66,14 @@ class SparkScala211Interpreter(override val conf: SparkConf,
       sparkHttpServer = server
       conf.set("spark.repl.class.uri", uri)
     }
+    val target = conf.get("spark.repl.target", "jvm-1.6")
 
     val settings = new Settings()
     settings.processArguments(List("-Yrepl-class-based",
       "-Yrepl-outdir", s"${outputDir.getAbsolutePath}"), true)
     settings.embeddedDefaults(sparkInterpreterClassLoader)
     settings.usejavacp.value = true
+    settings.target.value = target
 
     this.userJars = getUserJars()
     LOGGER.info("UserJars: " + userJars.mkString(File.pathSeparator))