squash w/ downgrade python script logic. Remove TODO for .dist files.…

… There will always be only one .dist file present in the home directory.

scripts/irods/upgrade_configuration.py

@@ -63,27 +63,6 @@ def raise_exception_if_downgrade_is_detected(irods_config):
 
     l.debug('Found [%s].', version_file_path_previous)
 
-    # TODO Remove this block since it doesn't make since for iRODS 5.
-    # There will never be a case where old ".dist" files exist during an upgrade.
-    """
-    # At this point, we know iRODS exists on this computer. Look for a ".dist" file.
-    # Start with the latest form of the file and work backwards based on iRODS
-    # versions.
-    version_file_path_dist = None
-    version_file_paths = [
-        paths.version_path() + '.dist',                             # >= 4.3.x
-        os.path.join(paths.irods_directory(), 'VERSION.json.dist'), # >= 4.1.x
-        os.path.join(paths.irods_directory(), 'VERSION')            # <  4.1.x
-    ]
-    for path in version_file_paths:
-        l.debug('Checking if [%s] exists.', path)
-        if os.path.exists(path):
-            version_file_path_dist = path
-            break
-
-    if version_file_path_dist is None:
-        raise IrodsError(f'Version file does not exist. Please check your installation or reinstall.')
-    """
     # At this point, we know a previous version of iRODS existed on this computer.
     # Look for the new ".dist" file.
     version_file_path_dist = paths.version_path() + '.dist'