fix pep8 template in tox.ini

otc_metadata/data/documents/bd-umn.yaml

@@ -1,6 +0,0 @@
----
-link: /business-dashboard/umn/
-rst_location: umn/source
-service_type: bd
-title: User Guide
-type: umn

otc_metadata/data/services/bd.yaml

@@ -1,13 +0,0 @@
----
-environment: internal
-repositories:
-- environment: internal
-  repo: docs/business-dashboard
-  type: gitea
-service_category: other
-service_title: Business Dashboard
-service_type: bd
-service_uri: business-dashboard
-teams:
-- name: docs-dashboard-rw
-  permission: write

otc_metadata/templates/tox.ini.j2

@@ -13,6 +13,8 @@ commands = stestr run {posargs}
   stestr slowest
 
 [testenv:pep8]
+allowlist_externals =
+  doc8
 commands =
   doc8 doc/source README.rst