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_integration/test_testconfig.py

@@ -129,6 +129,12 @@ class CheckConfig(object):
         assert_deepequal(self.get_output_dict(), conf.to_dict())
         self.check_config(conf)
 
+    # Settings to override:
+    extra_input_dict = {}
+    extra_input_env = {}
+    extra_output_dict = {}
+    extra_output_env = {}
+
 
 class TestEmptyConfig(CheckConfig):
     extra_input_dict = {}