Spark-2447 : Spark on HBase

Add common solution for sending upsert actions to HBase (put, deletes,
and increment)

This is the first pull request: mainly to test the review process, but there are still a number of things that I plan to add this week.

1. Clean up the pom file
2. Add unit tests for the HConnectionStaticCache

If I have time I will also add the following:
1. Support for Java
2. Additional unit tests for Java
3. Additional unit tests for Spark Streaming
For the same reason, don't add exclusions here. They should be in the parent. There should only be exclusions if there is a specific reason that this components needs different dependencies only in this module. The parent already gets hadoop exclusions correct over a range of versions.