cleanup: Remove unused imports.

Generated by autoflake.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

zulip/integrations/zephyr/check-mirroring

@@ -2,7 +2,6 @@
 import sys
 import time
 import optparse
-import os
 import random
 import logging
 import subprocess

zulip/integrations/zephyr/zephyr_mirror.py

@@ -12,7 +12,6 @@ from zephyr_mirror_backend import parse_args
 (options, args) = parse_args()
 
 from types import FrameType
-from typing import Any
 
 def die(signal: int, frame: FrameType) -> None:
 
@@ -44,7 +43,6 @@ if options.forward_class_messages and not options.noshard:
         return 0
     for (status, job) in run_parallel(run_job, jobs, threads=16):
         print("A mirroring shard died!")
-        pass
     sys.exit(0)
 
 backoff = RandomExponentialBackoff(timeout_success_equivalent=300)

zulip/integrations/zephyr/zephyr_mirror_backend.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 
-from typing import IO, Any, Dict, List, Text, Union, Set, Tuple, Optional, cast
+from typing import Any, Dict, IO, List, Optional, Set, Text, Tuple, cast
 from types import FrameType
 
 import sys
@@ -10,7 +10,6 @@ import time
 import subprocess
 import optparse
 import os
-import datetime
 import textwrap
 import signal
 import logging