LIVY-315. Enable hive in SparkRInterpreter

[zjffdu]

livy.repl.enableHiveContext doesn't take effect in SparkRInterpreter. Fix it in this PR.

Tested it manually for both spark 1.6 and spark 2.1

[zjffdu]

@tc0312 @jerryshao Please help review. CI failure is not relevant.

[ERROR] Failed to execute goal org.jacoco:jacoco-maven-plugin:0.7.7.201606060606:report-aggregate (jacoco-report) on project livy-coverage-report: An error has occurred in JaCoCo Aggregate report generation. Error while creating report: null: EOFException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.jacoco:jacoco-maven-plugin:0.7.7.201606060606:report-aggregate (jacoco-report) on project livy-coverage-report: An error has occurred in JaCoCo Aggregate report generation.

[jerryshao]

It is a jacoco issue, you could rerun again as a workaround.

[jerryshao]

It's weird this jacoco failure happens quite frequently in your PR, something might be wrong. Ping @tc0312 .

[codecov-io]

Codecov Report

Merging #293 into master will increase coverage by 0.06%.
The diff coverage is 36.36%.

@@             Coverage Diff              @@
##             master     #293      +/-   ##
============================================
+ Coverage     70.57%   70.63%   +0.06%     
- Complexity      670      676       +6     
============================================
  Files            92       92              
  Lines          4812     4819       +7     
  Branches        720      723       +3     
============================================
+ Hits           3396     3404       +8     
+ Misses          927      926       -1     
  Partials        489      489

Impacted Files	Coverage Δ	Complexity Δ
...la/com/cloudera/livy/repl/ProcessInterpreter.scala	55.1% <ø> (-1.15%)	1 <ø> (ø)
...ala/com/cloudera/livy/repl/SparkRInterpreter.scala	64.02% <40%> (-1.39%)	2 <ø> (ø)
...in/java/com/cloudera/livy/rsc/ContextLauncher.java	80.93% <ø> (-2.12%)	19% <ø> (ø)
.../java/com/cloudera/livy/rsc/driver/JobWrapper.java	80.64% <ø> (ø)	8% <ø> (+1%)	✅
...n/java/com/cloudera/livy/rsc/driver/RSCDriver.java	78.87% <ø> (+2.58%)	42% <ø> (+3%)	✅
.../java/com/cloudera/livy/rsc/rpc/RpcDispatcher.java	69.56% <ø> (+3.26%)	20% <ø> (+1%)	✅
...va/com/cloudera/livy/rsc/rpc/KryoMessageCodec.java	98.11% <ø> (+3.77%)	19% <ø> (+1%)	✅

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