Move to Spark 2.0

[arahuja]

It seems like this will involve:

• removing/moving references org.apache.spark.logging
• upgrading ADAM
• upgrading spark-testing-base to 2.0.0_0.4.4

@ryan-williams have you tried this out already, I remember you were looking at the ADAM upgrade

[ryan-williams]

I haven't paid much attention to their 2.0.0-upgrade efforts yet, so I don't have a good sense of what that will entail.

[fnothaft]

I haven't paid much attention to their 2.0.0-upgrade efforts yet, so I don't have a good sense of what that will entail.

They're pretty simple. It's mostly been POM/CI changes thus far, as well as moving away from org.apache.spark.Logging. The big impacts were that there were a variety of methods that were deprecated in Spark 1.x that got removed, and then org.apache.spark.Logging got removed.