[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: I0965f2a12ca5097d8b4aa5daec5acf149cde8ab5

Author: Sharpz7

setup.cfg

@@ -54,3 +54,9 @@ generic_switch.devices =
     netmiko_fake = networking_generic_switch.devices.netmiko_devices.fake:Fake
 tempest.test_plugins =
     ngs_tests = tempest_plugin.plugin:NGSTempestPlugin
+
+[codespell]
+quiet-level = 4
+# Words to ignore:
+# cna: Intel CNA card
+ignore-words-list = cna

tox.ini

@@ -99,3 +99,13 @@ commands =
 
 [hacking]
 import_exceptions = networking_generic_switch._i18n
+
+[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}
+