Explore is broken on Hive 0.10
Description
There are a couple of issues with Explore on Hive 0.10 (part of CDH 4.3 - which seems like we support).
1. SessionState.setCurrentDatabase()`` is unavailable in hive 0.10
2. NPE at HiveStreamRedirector#142. Looks like SessionState is null.
Release Notes
None
