Enabled URLSession tests

Author: nethraravindran

TestFoundation/TestNSURLSession.swift

@@ -32,9 +32,9 @@ class TestURLSession : XCTestCase {
             ("test_downloadTaskWithURLAndHandler", test_downloadTaskWithURLAndHandler),
 //            ("test_finishTaskAndInvalidate", test_finishTasksAndInvalidate),
 //            ("test_taskError", test_taskError),
-//            ("test_taskCopy", test_taskCopy),
-            ("test_cancelTask", test_cancelTask),
-            ("test_taskTimeout", test_taskTimeout),
+            ("test_taskCopy", test_taskCopy),
+//            ("test_cancelTask", test_cancelTask),
+//            ("test_taskTimeout", test_taskTimeout),
             ("test_verifyRequestHeaders", test_verifyRequestHeaders),
             ("test_verifyHttpAdditionalHeaders", test_verifyHttpAdditionalHeaders),
             ("test_timeoutInterval", test_timeoutInterval),