datetime and timezone unneeded here (ts_utc in util), and corrected c…

…omment in hpss

zstash/create.py

@@ -7,7 +7,6 @@
 import sqlite3
 import sys
 from typing import Any, List, Tuple
-from datetime import datetime, timezone
 
 from six.moves.urllib.parse import urlparse
 

zstash/hpss.py

@@ -92,7 +92,7 @@ def hpss_transfer(
             logger.info(f"{ts_utc()}: DIVING: hpss calls globus_transfer(name={name})")
             globus_status = globus_transfer(endpoint, url_path, name, transfer_type, non_blocking)
             logger.info(f"{ts_utc()}: SURFACE hpss globus_transfer(name={name}) returns {globus_status}")
-            # NOTE: Here, the status could be "TIMEOUT_RETRIES_EXHAUSTED", meaning a very long transfer
+            # NOTE: Here, the status could be "EXHAUSTED_TIMEOUT_RETRIES", meaning a very long transfer
             # or perhaps transfer is hanging. We should decide whether to ignore it, or cancel it, but
             # we'd need the task_id to issue a cancellation.  Perhaps we should have globus_transfer
             # return a tuple (task_id, status).