Replace deprecated inspect.getargspec

inspect.getargspec was deprecated since Python 3.0 and
inspect.getfullargspec is its replacement with correct handling of
function annotations and keyword-only parameters[1].

[1] https://docs.python.org/3/library/inspect.html#inspect.getargspec

Change-Id: I29478df88665ee5311e3ba308ab645c47e5b0fc8

oslo_versionedobjects/test.py

@@ -178,8 +178,8 @@ class TestCase(testtools.TestCase):
                          baseclass)
 
         for name in sorted(implmethods.keys()):
-            baseargs = inspect.getargspec(basemethods[name])
-            implargs = inspect.getargspec(implmethods[name])
+            baseargs = inspect.getfullargspec(basemethods[name])
+            implargs = inspect.getfullargspec(implmethods[name])
 
             self.assertEqual(baseargs, implargs,
                              "%s args don't match base class %s" %

oslo_versionedobjects/tests/test_fixture.py

@@ -757,9 +757,11 @@ class TestMethodSpec(test.TestCase):
         self._test_method3 = test_method3
 
     def test_method_spec_compat(self):
-        self.assertEqual(inspect.getargspec(self._test_method1),
+        self.assertEqual(inspect.ArgSpec(args=['a', 'b', 'kw1'], varargs=None,
+                                         keywords='kwargs', defaults=(123,)),
                          fixture.get_method_spec(self._test_method1))
-        self.assertEqual(inspect.getargspec(self._test_method2),
+        self.assertEqual(inspect.ArgSpec(args=['a', 'b'], varargs='args',
+                                         keywords=None, defaults=None),
                          fixture.get_method_spec(self._test_method2))
         self.assertEqual(inspect.getfullargspec(self._test_method3),
                          fixture.get_method_spec(self._test_method3))