Fix unneccessary re-downloads when re-vendoring

setup/revendor.py

@@ -32,10 +32,10 @@ class ReVendor(Command):
         for i in range(num):
             try:
                 raw = download_securely(url)
-            except Exception:
+            except Exception as err:
                 if i == num - 1:
                     raise
-            self.info('Download failed, sleeping and retrying...')
+                self.info(f'Download failed with error "{err}" sleeping and retrying...')
                 time.sleep(2)
         with tarfile.open(fileobj=BytesIO(raw)) as tf:
             tf.extractall(tdir)