[SPARK-6909][SQL] Remove Hive Shim code #6604
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This is a follow-up on #6393. I am removing the following files in this PR.
Basically, I re-factored the shim code as follows-
But for leftover code that didn't fit in any of these cases, I created a HiveShim object. For eg, helper functions which wrap Hive 0.13 methods to work around Hive bugs are placed here.