python: enable code formatting

Enable code formatting in CI by creating a dummy Python 'setup.cfg'
and fix up the minor errors reported.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9ddaa263f7407c42fb4f58d478bd2efb1d2fe026
diff --git a/extensions/openpower-pels/registry/tools/process_registry.py b/extensions/openpower-pels/registry/tools/process_registry.py
index fcdacf5..8f8eb78 100755
--- a/extensions/openpower-pels/registry/tools/process_registry.py
+++ b/extensions/openpower-pels/registry/tools/process_registry.py
@@ -93,9 +93,9 @@
 
         if num_placeholders != \
                 len(entry['Documentation']['MessageArgSources']):
-                    sys.exit("Different number of placeholders found in "
-                             "Message vs MessageArgSources for error {}".
-                             format(entry['Name']))
+            sys.exit("Different number of placeholders found in "
+                     "Message vs MessageArgSources for error {}".
+                     format(entry['Name']))
 
 
 def validate_schema(registry, schema):