typing: Remove now-unnecessary conditional import.

As a result of dropping support for trusty, we can remove our old
pattern of putting `if False` before importing the typing module,
which was essential for Python 3.4 support, but not required and maybe
harmful on newer versions.

cron_file_helper
check_rabbitmq_consumers
hash_reqs
check_zephyr_mirror
check_personal_zephyr_mirrors
check_cron_file
zulip_tools
check_postgres_replication_lag
api_test_helpers
purge-old-deployments
setup_venv
node_cache
clean_venv_cache
clean_node_cache
clean_emoji_cache
pg_backup_and_purge
restore-backup
generate_secrets
zulip-ec2-configure-interfaces
diagnose
check_user_zephyr_mirror_liveness

scripts/nagios/check-rabbitmq-consumers

@@ -7,10 +7,7 @@ import configparser
 from collections import defaultdict
 import os
 import subprocess
-
-if False:
-    # See https://zulip.readthedocs.io/en/latest/testing/mypy.html#mypy-in-production-scripts
-    from typing import Dict
+from typing import Dict
 
 states = {
     0: "OK",

scripts/nagios/cron_file_helper.py

@@ -1,8 +1,6 @@
 import time
 
-if False:
-    # See https://zulip.readthedocs.io/en/latest/testing/mypy.html#mypy-in-production-scripts
-    from typing import Tuple
+from typing import Tuple
 
 def nagios_from_file(results_file):
     # type: (str) -> Tuple[int, str]