[#3] call assertRaisesRegex[p] with/without final 'p' (depends on Python 2 or 3)

The test:
  irods.test.access_test.TestAccess.test_iRODSAccess_cannot_be_constructed_using_unsupported_type__issue_558
needs this change to pass under Python2.

del empty line

Author: d-w-moore

irods/test/access_test.py

@@ -444,7 +444,11 @@ def test_iRODSAccess_cannot_be_constructed_using_unsupported_type__issue_558(sel
         # Before the fix in #558, this would have been allowed and only later would the type discrepancy be revealed,
         # leading to opaque error messages. Now, the types are checked on the way in to ensure clarity and correctness.
         # TODO(#480): We cannot use the unittest.assertRaises context manager as this was introduced in python 3.1.
-        self.assertRaisesRegex(
+        assertCall = getattr(self,'assertRaisesRegex',None)
+        if assertCall is None:
+            assertCall = self.assertRaisesRegexp
+
+        assertCall(
             TypeError,
             "'path' parameter must be of type 'str', 'irods.collection.iRODSCollection', "
             "'irods.data_object.iRODSDataObject', or 'irods.path.iRODSPath'.",