Automatically initiate reauth if token expires

[etoews]

If you have an expired token, you get the exception

(google-photos-sync-check) bash-3.2$ python google-photos-sync-check.py --verbose rebuild_db
Traceback (most recent call last):
  File "google-photos-sync-check.py", line 224, in <module>
    args.func(args)
  File "google-photos-sync-check.py", line 153, in rebuild_db
    for album_page in album_pages:
  File "google-photos-sync-check.py", line 33, in get_album_pages
    albums_response = photoslibrary.albums().list().execute()
  File "/Users/etoews/.local/share/virtualenvs/google-photos-sync-check-9wSNJ860/lib/python3.8/site-packages/googleapiclient/_helpers.py", line 134, in positional_wrapper
    return wrapped(*args, **kwargs)
  File "/Users/etoews/.local/share/virtualenvs/google-photos-sync-check-9wSNJ860/lib/python3.8/site-packages/googleapiclient/http.py", line 883, in execute
    resp, content = _retry_request(
  File "/Users/etoews/.local/share/virtualenvs/google-photos-sync-check-9wSNJ860/lib/python3.8/site-packages/googleapiclient/http.py", line 172, in _retry_request
    resp, content = http.request(uri, method, *args, **kwargs)
  File "/Users/etoews/.local/share/virtualenvs/google-photos-sync-check-9wSNJ860/lib/python3.8/site-packages/oauth2client/transport.py", line 186, in new_request
    credentials._refresh(orig_request_method)
  File "/Users/etoews/.local/share/virtualenvs/google-photos-sync-check-9wSNJ860/lib/python3.8/site-packages/oauth2client/client.py", line 761, in _refresh
    self._do_refresh_request(http)
  File "/Users/etoews/.local/share/virtualenvs/google-photos-sync-check-9wSNJ860/lib/python3.8/site-packages/oauth2client/client.py", line 819, in _do_refresh_request
    raise HttpAccessTokenRefreshError(error_msg, status=resp.status)
oauth2client.client.HttpAccessTokenRefreshError: invalid_grant: Bad Request

The client_token.json should be automatically deleted and the auth process retried.