[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: Id89f63b1ad08abdea875a579657e4e63e1cbcf88

setup.cfg

@@ -25,3 +25,7 @@ classifier =
 [files]
 packages =
     ironic_ui
+
+[codespell]
+quiet-level = 4
+skip = *.po,*.pot

tox.ini

@@ -102,3 +102,11 @@ commands =
     -k npgettext:1c,2,3 -k pgettext_lazy:1c,2 -k npgettext_lazy:1c,2,3 \
     --add-comments Translators: ironic_ui
 
+[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}