Fix pep8 job

New flake8 came out with new & improved rules. Ignore E741; it would be
too much churn. Fix the rest.

Change-Id: I9125c8c53423232309a75cbcc5b695b378864c1b

test/unit/common/test_db.py

@@ -1289,7 +1289,7 @@ class TestDatabaseBroker(unittest.TestCase):
         for c in range(MAX_META_COUNT):
             key = 'X-Account-Meta-F{0}'.format(c)
             metadata[key] = ('B', normalize_timestamp(1))
-        key = 'X-Account-Meta-Foo'.format(c)
+        key = 'X-Account-Meta-Foo'
         metadata[key] = ('', normalize_timestamp(1))
         self.assertIsNone(DatabaseBroker.validate_metadata(metadata))
 

tox.ini

@@ -143,10 +143,11 @@ commands = bandit -c bandit.yaml -r swift -n 5
 # changes to enable:
 # E402: module level import not at top of file
 # E731 do not assign a lambda expression, use a def
+# E741 ambiguous variable name
 # Swift team needs to decide if they want to enable either of these:
 # W503: line break before binary operator
 # W504: line break after binary operator
-ignore = H101,H202,H301,H306,H404,H405,H501,W503,W504,E402,E731
+ignore = H101,H202,H301,H306,H404,H405,H501,W503,W504,E402,E731,E741
 exclude = .venv,.tox,dist,*egg
 filename = *.py,bin/*
 show-source = True