per #2423, follow symbolic links when traversing directories to find …

…files within a time window, ci-run-all-diff

metplus/wrappers/command_builder.py

@@ -757,7 +757,7 @@ def _get_closest_files(self, data_dir, template, valid_time,
                                             "%Y%m%d%H%M%S").strftime("%s"))
 
         # step through all files under input directory in sorted order
-        for dirpath, _, all_files in os.walk(data_dir):
+        for dirpath, _, all_files in os.walk(data_dir, followlinks=True):
             for filename in sorted(all_files):
                 fullpath = os.path.join(dirpath, filename)