Remove ignoring _ builtin usage for pep8

We did not use it.

Change-Id: I0d5d67ab047b1de609eb4cc85627c79eced1a57c

ovsdbapp/tests/utils.py

@@ -55,8 +55,7 @@ def get_related_rand_names(prefixes, max_length=None):
     if max_length:
         length = max_length - max(len(p) for p in prefixes)
         if length <= 0:
-            raise ValueError(
-                _("'max_length' must be longer than all prefixes"))
+            raise ValueError("'max_length' must be longer than all prefixes")
     else:
         length = 8
     rndchrs = get_random_string(length)

tox.ini

@@ -42,5 +42,4 @@ setenv = {[testenv]setenv}
 
 show-source = True
 ignore = E123,E125
-builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build