[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: I90886dbb7ad7adf5520f8cc436012fa63c89ca78

setup.cfg

@@ -37,3 +37,9 @@ virtualbmc =
     stop = virtualbmc.cmd.vbmc:StopCommand
     list = virtualbmc.cmd.vbmc:ListCommand
     show = virtualbmc.cmd.vbmc:ShowCommand
+
+[codespell]
+quiet-level = 4
+# Words to ignore:
+# cna: Intel CNA card
+ignore-words-list = cna

tox.ini

@@ -76,3 +76,12 @@ import-order-style = pep8
 application-import-names = virtualbmc
 exclude =  .venv,.git,.tox,dist,doc,*lib/python*,*egg,build
 max-complexity=17
+
+[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}