log results for get_best_parsable_locale (#77319)

* log locale outcomes from function
* also included variant forms of same prefs

changelogs/fragments/log_locale_selection_results.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - get_parsable_locale now logs result when in debug mode.

lib/ansible/module_utils/common/locale.py

@@ -32,7 +32,7 @@ def get_best_parsable_locale(module, preferences=None, raise_on_locale=False):
         if preferences is None:
             # new POSIX standard or English cause those are messages core team expects
             # yes, the last 2 are the same but some systems are weird
-            preferences = ['C.utf8', 'en_US.utf8', 'C', 'POSIX']
+            preferences = ['C.utf8', 'C.UTF-8', 'en_US.utf8', 'en_US.UTF-8', 'C', 'POSIX']
 
         rc, out, err = module.run_command([locale, '-a'])
 
@@ -50,8 +50,12 @@ def get_best_parsable_locale(module, preferences=None, raise_on_locale=False):
                     found = pref
                     break
 
-    except RuntimeWarning:
+    except RuntimeWarning as e:
         if raise_on_locale:
             raise
+        else:
+            module.debug('Failed to get locale information: %s' % to_native(e))
+
+    module.debug('Matched prefered locale to: %s' % found)
 
     return found