Enable pep8 testing on tests

* Add tests directory to the flake8 and linters env
* Fix up the tests failing pep8

Change-Id: I18446ed58b654fa9829e4de77219792e7b0bbbc4

tests/unit/test_bandit_baseline.py

@@ -14,14 +14,15 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-import bandit.cli.baseline as baseline
-
-import fixtures
 import os
 import subprocess
+
+import fixtures
+import git
 import testtools
 
-import git
+import bandit.cli.baseline as baseline
+
 
 config = """
 include:
@@ -40,6 +41,7 @@ shell_injection:
         - os.system
 """
 
+
 class BanditBaselineToolTests(testtools.TestCase):
 
     def test_bandit_baseline(self):
@@ -125,4 +127,4 @@ class BanditBaselineToolTests(testtools.TestCase):
         repo_directory = self.useFixture(fixtures.TempDir()).path
         os.chdir(repo_directory)
         return_value = baseline.initialize()
-        self.assertEquals(return_value, (None, None, None))
+        self.assertEqual(return_value, (None, None, None))