HBaseInputFormat tests and fix

[sjudeng]

Reproduce and resolve issue #1268.

[titan-cla]

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[graben1437]

You might want to check pull request 1218 which makes the same changes plus cleans up a lot of old Titan back level support.

[sjudeng]

Thanks @graben1437. I'm having trouble testing on that branch. See question in #1218.

[sjudeng]

@graben1437, unfortunately issue #1268 is not resolved in #1218. To reproduce the error, you can cherry pick the first commit from this PR, which adds HBaseInputFormat tests.

git remote add graben1437 https://github.com/graben1437/titan.git
git fetch graben1437
git checkout hbase-support1
git merge titan11
git remote add ngageoint https://github.com/ngageoint/titan.git
git fetch ngageoint
git cherry-pick 4b163aa4c7a253052f6090d94e0be6caf4e316fa
mvn clean install -DskipTests
mvn verify -Phadoop2 -Dit.test="**/HBaseInputFormatIT.java" -DfailIfNoTests=false -rf :titan-hadoop-2

Running com.thinkaurelius.titan.hadoop.HBaseInputFormatIT
...
testReadGraphOfTheGods(com.thinkaurelius.titan.hadoop.HBaseInputFormatIT)  Time elapsed: 40.625 sec  <<< ERROR!
java.lang.IllegalStateException: org.apache.spark.SparkException: Job aborted due to stage failure: Task 0 in stage 0.0 failed 1 times, most recent failure: Lost task 0.0 in stage 0.0 (TID 0, localhost): java.lang.ClassCastException: org.apache.hadoop.hbase.mapreduce.TableInputFormatBase$1 cannot be cast to org.apache.hadoop.hbase.mapreduce.TableRecordReader
    at com.thinkaurelius.titan.hadoop.formats.hbase.HBaseBinaryInputFormat.createRecordReader(HBaseBinaryInputFormat.java:47)
    at com.thinkaurelius.titan.hadoop.formats.util.GiraphInputFormat.createRecordReader(GiraphInputFormat.java:53)

The error is resolved in the second commit in this PR.

git cherry-pick 30c59eaaee5929c46f02353aef12554ea952a9dd
mvn clean install -DskipTests
mvn verify -Phadoop2 -Dit.test="**/HBaseInputFormatIT.java" -DfailIfNoTests=false -rf :titan-hadoop-2

Running com.thinkaurelius.titan.hadoop.HBaseInputFormatIT
...
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0