[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: Ib439c9873d601bb140bd3f97acb5ee2d551c7063

setup.cfg

@@ -29,3 +29,8 @@ packages =
 [entry_points]
 sushy.resources.system.oems =
     contoso = sushy.resources.oem.fake:get_extension
+
+[codespell]
+quiet-level = 4
+# Words to ignore:
+# ignore-words-list = example

tox.ini

@@ -87,3 +87,12 @@ exclude=.*,dist,doc,*lib/python*,*egg,build
 import-order-style = pep8
 application-import-names = sushy
 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}