Run pylint on tests

Drop support for pylint < 1.0

Enable ignoring unknown attributes on modules (both nose and pytest
use advanced techniques, support for which only made it to pylint
recently)

Fix some bugs revealed by pylint

Do minor refactoring or add pylint:disable directives where the
linter complains.

Reviewed-By: Tomas Babej <tbabej@redhat.com>

ipatests/test_ipapython/test_ipautil.py

@@ -128,6 +128,11 @@ class TestCIDict(object):
         nose.tools.assert_equal(3, len(self.cidict))
         self.cidict.clear()
         nose.tools.assert_equal(0, len(self.cidict))
+        assert self.cidict == {}
+        assert self.cidict.keys() == []
+        assert self.cidict.values() == []
+        assert self.cidict.items() == []
+        assert self.cidict._keys == {}
 
     def test_copy(self):
         copy = self.cidict.copy()
@@ -309,14 +314,6 @@ class TestCIDict(object):
         assert sorted(dct.keys()) == sorted(['A', 'b', 'C'])
         assert sorted(dct.values()) == [None] * 3
 
-    def test_clear(self):
-        self.cidict.clear()
-        assert self.cidict == {}
-        assert self.cidict.keys() == []
-        assert self.cidict.values() == []
-        assert self.cidict.items() == []
-        assert self.cidict._keys == {}
-
 
 class TestTimeParser(object):
     def test_simple(self):