Fix flakey HiveQuerySuite test

Result may not be returned in the expected order, so relax that constraint.

Author: Aaron Davidson <aaron@databricks.com>

Closes #1514 from aarondav/flakey and squashes the following commits:

e5af823 [Aaron Davidson] Fix flakey HiveQuerySuite test

Conflicts:
	sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveQuerySuite.scala
Handle cases where SET returns Rows of (single) strings