Fix section overrides when commented option persist

In cases, when key already exist, but commented out without space
(ie "#key) and is not in default section, it's not updated with
sectdict.insert statement. That is possible happens because
self._sections keys are protected and can't be overwritten (at least
new assignment makes no difference)

Change-Id: Ie0c588a2d559bd38c68b3d018e547a036d83214c
Closes-Bug: #1889547

action/config_template.py

@@ -204,19 +204,15 @@ class ConfigTemplateParser(ConfigParser.RawConfigParser):
                 use_defaults = False
 
         option = self.optionxform(option)
-        try:
-            index = sectdict.index('#%s' % option)
-        except (ValueError, IndexError):
-            sectdict[option] = value
-        else:
-            if use_defaults:
-                self._defaults = sectdict.insert(index, option, value)
+        if use_defaults:
+            try:
+                index = sectdict.index('#%s' % option)
+            except (ValueError, IndexError):
+                sectdict[option] = value
             else:
-                self._sections[section] = sectdict.insert(
-                    index,
-                    option,
-                    value
-                )
+                self._defaults = sectdict.insert(index, option, value)
+        else:
+            sectdict[option] = value
 
     def _write(self, fp, section, key, item, entry):
         if section:

tests/files/test_comment_configs.ini.expected

@@ -33,6 +33,7 @@ test = test1,test2
 testopt1 = 9000
 # This is another test opt
 #testop2 = over 9000
+testop2 = below 9000
 
 [TestSection]
 things = stuff

tests/test.yml

@@ -181,6 +181,8 @@
           - test2
       TestSection:
         things: stuff
+      SubSection:
+        testop2: below 9000
     diff_ini:
       added:
         DEFAULT: