The test framework should clear query options before an implicit USE statement.
The test framework should clear query options before an implicit USE statement.

Some tests have vectors that move from a query option which throws an exception (e.g bad
mem limit), to a sane set of query options. It's possible for the test framework to issue
a USE statement with a bad query option ( left over from the last executed query ) and
fail when it's not supposed to.

Change-Id: I7a10ebddd5fbc9b20fd32c365c5f5037088b63b4
Reviewed-on: http://gerrit.ent.cloudera.com:8080/223
Reviewed-by: Ishaan Joshi <d1d1e60202ec9f2503deb1b724986485a125d802@cloudera.com>
Tested-by: Ishaan Joshi <d1d1e60202ec9f2503deb1b724986485a125d802@cloudera.com>

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