[tests][monotouch-tests] Skip UrlSessionTest.CreateDataTaskAsync as all cases fails on watchOS 3 beta 3 (#449)

tests/monotouch-test/Foundation/UrlSessionTest.cs

@@ -26,7 +26,11 @@ namespace MonoTouchFixtures.Foundation {
 	[TestFixture]
 	[Preserve (AllMembers = true)]
 	public class UrlSessionTest {
+
+		// FIXME all test cases are failing on bots with Xcode 8 / watchOS 3
+#if !__WATCHOS__
 		[Test]
+#endif
 		public void CreateDataTaskAsync ()
 		{
 			TestRuntime.AssertXcodeVersion (5, 0);