Add tox.ini with pep8 tests to fix CI

* Add tox.ini with pep8 tests so 'gate-fuel-web-pep8' is able to
  actually run
* Fix existing pep8 warnings

Change-Id: Iad59da7f8e5af901e7c9fa830f3a6ebe81d021b3
Related-Bug: #1511787

nailgun/conftest.py

@@ -43,7 +43,8 @@ def pytest_configure(config):
     settings.DATABASE['name'] = db_name
     cleandb = config.getoption('cleandb')
     if cleandb:
-        from nailgun.db import dropdb, syncdb
+        from nailgun.db import dropdb
+        from nailgun.db import syncdb
         dropdb()
         syncdb()
 

nailgun/manage.py

@@ -224,9 +224,9 @@ def action_migrate(params):
 
 
 def action_extensions(params):
-    from nailgun.logger import logger
     from nailgun.db.migration import action_migrate_alembic_extension
     from nailgun.extensions import get_all_extensions
+    from nailgun.logger import logger
 
     for extension in get_all_extensions():
         if extension.alembic_migrations_path():

tox.ini

@@ -0,0 +1,10 @@
+[tox]
+minversion = 1.6
+skipsdist = True
+setupdir = {toxinidir}/nailgun
+envlist = pep8
+
+[testenv:pep8]
+deps = hacking==0.7
+commands =
+    flake8 {posargs:nailgun}