[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: I659e85270fa0024f69f57ffd6002c2eb20c3b1f4

setup.cfg

@@ -30,3 +30,8 @@ packages =
 oslo.messaging.notify.drivers =
     prometheus_exporter = ironic_prometheus_exporter.messaging:PrometheusFileDriver
     file_exporter = ironic_prometheus_exporter.messaging:SimpleFileDriver
+
+[codespell]
+quiet-level = 4
+# Words to ignore:
+; ignore-words-list = example

tox.ini

@@ -72,3 +72,12 @@ application-import-names = ironic_prometheus_exporter
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 import-order-style = pep8
 show-source = True
+
+[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}