Update flake8 style enforcement

Added enforcement of H106, H203, H204 and H205 extensions to
match neutron repo, fixing a few failures in the process.

Also updated to support hacking 1.1.0, bringing in flake8
2.6.2 and pycodestyle 2.4.0 in the process.  This ensures
future python3 compatibility and a bit better code styling.

Change-Id: Ibd9cff863eaff940755ccb9c20f39e29e2001cde

lower-constraints.txt

@@ -13,12 +13,12 @@ eventlet==0.18.2
 extras==1.0.0
 fasteners==0.7.0
 fixtures==3.0.0
-flake8==2.5.5
+flake8==2.6.2
 flake8-import-order==0.12
 future==0.16.0
 futurist==1.2.0
 greenlet==0.4.10
-hacking==0.12.0
+hacking==1.1.0
 imagesize==0.7.1
 iso8601==0.1.11
 Jinja2==2.10
@@ -61,7 +61,7 @@ pep8==1.5.7
 pika==0.10.0
 pika-pool==0.1.3
 prettytable==0.7.2
-pycodestyle==2.3.1
+pycodestyle==2.4.0
 pyflakes==0.8.1
 Pygments==2.2.0
 pyinotify==0.9.6

neutron_lib/tests/unit/db/test_api.py

@@ -158,7 +158,7 @@ class TestDeadLockDecorator(_base.BaseTestCase):
         if exc_to_raise == db_exc.DBDeadlock:
             self.assertEqual(True, (fake_timer.counter <= sum(worst_case)))
         else:
-            self.assertTrue(sum(worst_case) >= fake_timer.counter)
+            self.assertGreaterEqual(sum(worst_case), fake_timer.counter)
 
     def test_all_deadlock_time_elapsed(self):
         self._test_retry_time_cost(db_exc.DBDeadlock)

neutron_lib/tests/unit/hacking/test_checks.py

@@ -38,13 +38,13 @@ class HackingTestCase(base.BaseTestCase):
         return check_fns
 
     def test_factory(self):
-        self.assertTrue(len(self._get_factory_checks(checks.factory)) > 0)
+        self.assertGreater(len(self._get_factory_checks(checks.factory)), 0)
 
     def test_neutron_lib_factory(self):
         lib_checks = self._get_factory_checks(checks._neutron_lib_factory)
         other_checks = self._get_factory_checks(checks.factory)
 
-        self.assertTrue(len(lib_checks) > 0)
+        self.assertGreater(len(lib_checks), 0)
 
         if other_checks:
             for other_check in other_checks:

neutron_lib/tests/unit/utils/test_runtime.py

@@ -116,5 +116,5 @@ class TestListPackageModules(base.BaseTestCase):
 
     def test_list_package_modules(self):
         # mainly just to ensure we can import modules for both PY2/PY3
-        self.assertTrue(
-            len(runtime.list_package_modules('neutron_lib.exceptions')) > 3)
+        self.assertGreater(
+            len(runtime.list_package_modules('neutron_lib.exceptions')), 3)

tox.ini

@@ -91,8 +91,12 @@ commands =
    {toxinidir}/tools/api_report.sh
 
 [flake8]
+# H106: Don't put vim configuration in source files
+# H203: Use assertIs(Not)None to check for None
+# H204: Use assert(Not)Equal to check for equality
+# H205: Use assert(Greater|Less)(Equal) for comparison
 # H904: Delay string interpolations at logging calls
-enable-extensions=H904
+enable-extensions=H106,H203,H204,H205,H904
 show-source = True
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools
 import-order-style = pep8