update cfgvalidator for oslo.config 6.0.1

New oslo.config version changed signature of a method
cfgvalidator relies on. Updated accordingly to work
for both new and old oslo.config.

Closes-Bug: 1761258

Change-Id: Icd2e489eb73754fee41d9d4324be6802caae7ec4

congress/cfg_validator/parsing.py

@@ -15,6 +15,7 @@
 #
 
 """Unmarshaling of options sent by the agent."""
+import inspect
 import sys
 
 from oslo_config import cfg
@@ -195,7 +196,21 @@ def add_parsed_conf(conf, normalized):
     if conf:
         # pylint: disable=protected-access
         conf._namespace = cfg._Namespace(conf)
-        conf._namespace._add_parsed_config_file(None, normalized[0])
+
+        # oslo.config version 6.0.1 added extra arg to _add_parsed_config_file
+        # we determine the number of args required to use appropriately
+        if six.PY2:
+            _add_parsed_config_file_args_len = len(inspect.getargspec(
+                conf._namespace._add_parsed_config_file).args) - 1
+            # - 1 to not count the first param self
+        else:
+            _add_parsed_config_file_args_len = len(inspect.signature(
+                conf._namespace._add_parsed_config_file).parameters)
+        if _add_parsed_config_file_args_len == 3:  # oslo.config>=6.0.1
+            conf._namespace._add_parsed_config_file(
+                '<memory>', [], normalized[0])
+        else:
+            conf._namespace._add_parsed_config_file([], normalized[0])
 
 
 def parse_config_file(namespaces, path):

congress/datasources/cfgvalidator_driver.py

@@ -488,6 +488,8 @@ class ValidatorDriver(datasource_driver.PollingDataSourceDriver):
 
             try:
                 value = option._get_from_namespace(cfg_ns, group_name)
+                if hasattr(cfg, 'LocationInfo'):
+                    value = value[0]
             except KeyError:
                 # No value parsed for this option
                 return