Change abstract methods in BaseRule to use NotImplementedError

As Kshitij mentioned, abstract methods should use NotImplementedError
instead of AppArmorBug.

While changing this, I noticed that __repr__() needs to be robust against
NotImplementedError because get_raw() is not available in BaseRule.
Therefore the patch changes __repr__() to catch NotImplementedError.

Of course the change to NotImplementedError also needs several
adjustments in the tests.


Acked-by: Kshitij Gupta <kgupta8592@gmail.com>
(long before branching off 2.10, therefore I'll also commit to 2.10)

utils/test/test-network.py

@@ -441,7 +441,7 @@ class NetworkGlobTestAATest(AATest):
     #     self.assertEqual(self.ruleset.get_glob('network inet raw,'), 'network inet,')
 
     def test_glob_ext(self):
-        with self.assertRaises(AppArmorBug):
+        with self.assertRaises(NotImplementedError):
             # get_glob_ext is not available for network rules
             self.ruleset.get_glob_ext('network inet raw,')