add defaults to --help

utils/encrypt_distribution_archive.py

@@ -36,7 +36,8 @@ def encrypt_distribution_archive(**kwargs):
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(description='encrypt distribution archive'
-            ' using provisioning key')
+            ' using provisioning key',
+                formatter_class=argparse.ArgumentDefaultsHelpFormatter)
 
     parser.add_argument('--passphrase', '-p', default=None,
             help='optional passphrase to decrypt deployment key')