[codespell] Adding CI target for Tox Codespell

Third in a series of commits to add Codespell to Ironic Repos. This commit adds the Tox Target to CI

A future commit could potentially add a git-blame-ignore-revs file if their are lots of spelling mistakes that could clutter git blame.

Change-Id: I868bf9777be36500e19e326667ff2859fb9eb936

Author: Sharpz7

zuul.d/networking-generic-switch-jobs.yaml

@@ -64,3 +64,10 @@
         s-proxy: False
         swift: False
         tempest: True
+
+- job:
+    name: networking-generic-switch-tox-codespell
+    parent: openstack-tox
+    timeout: 7200
+    vars:
+      tox_envlist: codespell

zuul.d/project.yaml

@@ -21,6 +21,8 @@
         # for ussuri are completed
         - ironic-grenade-dsvm-multinode-multitenant:
             voting: false
+        - networking-generic-switch-tox-codespell:
+            voting: false
     gate:
       jobs:
         - networking-generic-switch-tempest-dlm