Add skip filter to config-table directive

Some driver docs have different options in the table for
different configuration types. This adds the ability to
skip named properties to be able to control which options
get included in the table output.

Change-Id: I3c6e31bc11eaec5326314b6eb7e0184429f347bf

doc/ext/driver_opts.py

@@ -30,16 +30,19 @@ class ConfigTableDirective(rst.Directive):
     option_spec = {
         'table-title': directives.unchanged,
         'config-target': directives.unchanged,
+        'exclude-list': directives.unchanged,
     }
 
     has_content = True
 
-    def _doc_module(self, module):
+    def _doc_module(self, module, filters):
         """Extract config options from module."""
         options = []
         try:
             mod = importlib.import_module(module)
             for prop in dir(mod):
+                if prop in filters:
+                    continue
                 thing = getattr(mod, prop)
                 if isinstance(thing, cfg.Opt):
                     # An individual config option
@@ -84,6 +87,10 @@ class ConfigTableDirective(rst.Directive):
             'table-title',
             'Description of {} configuration options'.format(target))
 
+        # See if there are option sets that need to be ignored
+        exclude = self.options.get('exclude-list', '')
+        exclude_list = [e.strip() for e in exclude.split(',') if e.strip()]
+
         result.append('.. _{}:'.format(title.replace(' ', '-')), source)
         result.append('', source)
         result.append('.. list-table:: {}'.format(title), source)
@@ -95,7 +102,7 @@ class ConfigTableDirective(rst.Directive):
 
         options = []
         for module in modules:
-            retval = self._doc_module(module)
+            retval = self._doc_module(module, exclude_list)
             if retval:
                 options.extend(retval)
             else: