tempest: enable hacking rule checks

Now that we stopped copying tempest code into our tree, it's fair to
enable the pep8 checks for the subtree.

Change-Id: Ie23b4db2d4d0e3e75e8fdf4af3bf0a430069928e
diff --git a/neutron/tests/tempest/plugin.py b/neutron/tests/tempest/plugin.py
index e583b28..12a01ee 100644
--- a/neutron/tests/tempest/plugin.py
+++ b/neutron/tests/tempest/plugin.py
@@ -16,14 +16,14 @@
 
 import os
 
-from tempest import config
 from tempest.test_discover import plugins
 
 import neutron
 
+
 class NeutronTempestPlugin(plugins.TempestPlugin):
     def load_tests(self):
-        base_path =  os.path.split(os.path.dirname(
+        base_path = os.path.split(os.path.dirname(
             os.path.abspath(neutron.__file__)))[0]
         test_dir = "neutron/tests/tempest"
         full_test_dir = os.path.join(base_path, test_dir)