[codespell] Adding Tox Target for Codespell

Second in a series of commits to add Codespell to Ironic Repos. This one adds the command that was used to fix the spelling errors.

Future Commits will add CI support and potentially a git-blame-ignore-revs file if their are lots of spelling mistakes that could clutter git blame.

Change-Id: Ie92e24f7181f37a7b9a6a960a2c5d6ec0eb08773

setup.cfg

@@ -25,3 +25,8 @@ classifier =
 [files]
 packages =
     tenks
+
+[codespell]
+quiet-level = 4
+# Words to ignore:
+; ignore-words-list = example

tox.ini

@@ -95,3 +95,12 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 import-order-style = pep8
 application-import-names = tenks
 filename = *.py
+
+[testenv:codespell]
+description =
+  Run codespell to check spelling
+deps = codespell
+# note(JayF): {posargs} lets us run `tox -ecodespell -- -w` to get codespell
+#             to correct spelling issues in our code it's aware of.
+commands =
+  codespell {posargs}