dont override previous ini entries with defaults

corrected setting example, quotes mess up the regex
fixes #30633

examples/ansible.cfg

@@ -315,7 +315,7 @@
 #enable_plugins = host_list, virtualbox, yaml, constructed
 
 # ignore these extensions when parsing a directory as inventory source
-#ignore_extensions = '.pyc', '.pyo', '.swp', '.bak', '~', '.rpm', '.md', '.txt', '~', '.orig', '.ini', '.cfg', '.retry'
+#ignore_extensions = .pyc, .pyo, .swp, .bak, ~, .rpm, .md, .txt, ~, .orig, .ini, .cfg, .retry
 
 # ignore files matching these patterns when parsing a directory as inventory source
 #ignore_patterns=

lib/ansible/config/manager.py

@@ -292,11 +292,13 @@ class ConfigManager(object):
             if ftype and defs[config].get(ftype):
                 if ftype == 'ini':
                     # load from ini config
-                    try:  # FIXME: generaelize _loop_entries to allow for files also
+                    try:  # FIXME: generaelize _loop_entries to allow for files also, most of this code is dupe
                         for ini_entry in defs[config]['ini']:
-                            value = get_ini_config_value(self._parser, ini_entry)
+                            temp_value = get_ini_config_value(self._parser, ini_entry)
+                            if temp_value is not None:
+                                value = temp_value
                                 origin = cfile
-                            if value is not None and 'deprecated' in ini_entry:
+                                if 'deprecated' in ini_entry:
                                     self.DEPRECATED.append(('[%s]%s' % (ini_entry['section'], ini_entry['key']), ini_entry['deprecated']))
                     except Exception as e:
                         sys.stderr.write("Error while loading ini config %s: %s" % (cfile, to_native(e)))