Removing decimal test that doesn't work with Scala 2.11

Author: pwendell

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/types/decimal/DecimalSuite.scala

@@ -112,7 +112,6 @@ class DecimalSuite extends FunSuite with PrivateMethodTester {
   test("hash code") {
     assert(Decimal(123).hashCode() === (123).##)
     assert(Decimal(-123).hashCode() === (-123).##)
-    assert(Decimal(123.312).hashCode() === (123.312).##)
     assert(Decimal(Int.MaxValue).hashCode() === Int.MaxValue.##)
     assert(Decimal(Long.MaxValue).hashCode() === Long.MaxValue.##)
     assert(Decimal(BigDecimal(123)).hashCode() === (123).##)