Run tox linters on zuul check

It will prevent committing code rejected by linters.
Commit changes performed by black.

Change-Id: I5abe7f8aaec51c890bff355d0a544edae2992d5d

.zuul.yaml

@@ -1,3 +1,9 @@
+- job:
+    name: jjb-tox-linters
+    parent: tox
+    vars:
+      tox_envlist: linters
+
 - job:
     name: jjb-tox-cross-python-jenkins
     description: Tests compatibility with master branch of python-jenkins
@@ -22,6 +28,7 @@
       rtd_webhook_id: '47271'
     check:
       jobs:
+        - jjb-tox-linters
         - jjb-tox-cross-python-jenkins
         - jjb-tox-docs-linkcheck
         - tox-cover

jenkins_jobs/modules/project_multibranch.py

@@ -1851,6 +1851,7 @@ def add_filter_by_name_wildcard_behaviors(traits, data):
             fail_required=True,
         )
 
+
 def add_notification_context_trait(traits, data):
     """Change the default GitHub check notification context from
     "continuous-integration/jenkins/SUFFIX" to a custom label / suffix.
@@ -1889,4 +1890,4 @@ def add_notification_context_trait(traits, data):
             elif type(nc_suffix) == bool:
                 nc_trait_suffix.text = str(nc_suffix).lower()
             else:
-                nc_trait_suffix.text = nc_suffix
+                nc_trait_suffix.text = nc_suffix

tests/cmd/subcommands/test_list.py

@@ -32,8 +32,8 @@ class ListFromJenkinsTests(TestWithScenarios, CmdTestsBase):
             dict(
                 jobs=["folder1", "folder1/job1", "folder1/job2"],
                 globs=[],
-                found=["folder1", "folder1/job1", "folder1/job2"]
-            )
+                found=["folder1", "folder1/job1", "folder1/job2"],
+            ),
         ),
         (
             "multiple_with_glob",