progress: Drop tqdm and revert back to local urlgrabber copy

I thought tqdm was available everywhere, but it does not seem like
it will be in RHEL9. Revert back to the old urlgrabber copy, now
stored in virtinst/_progresspriv.py. If we ever want to try tqdm
again, we can just revert this commit

Signed-off-by: Cole Robinson <crobinso@redhat.com>

.coveragerc

@@ -3,6 +3,7 @@ source=virtinst/
 
 [report]
 skip_covered = yes
+omit=virtinst/_progresspriv.py
 
 exclude_lines =
     # Have to re-enable the standard pragma