SPARK-1812: sql/catalyst - remove scala.NotNull related tests

scala.NotNull Trait is removed in 2.11

Signed-off-by: Anand Avati <avati@redhat.com>
SPARK-1812: sql/hive - [FIXWARNING] replace Pair with Tuple

Signed-off-by: Anand Avati <avati@redhat.com>