tools: Remove unused imports.

tools/replacer.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 import argparse
-import sys
 from subprocess import check_call
 from typing import List, Dict, Union
 

tools/run-dev.py

@@ -108,7 +108,6 @@ os.environ['DJANGO_SETTINGS_MODULE'] = settings_module
 sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
 
 from scripts.lib.zulip_tools import WARNING, ENDC
-from django.conf import settings
 
 proxy_port = base_port
 django_port = base_port + 1

tools/test-help-documentation.py

@@ -4,16 +4,12 @@ import os
 import sys
 import subprocess
 
-import time
-
 ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
 # check for the venv
 from lib import sanity_check
 sanity_check.check_venv(__file__)
 
-import requests
-
 parser = argparse.ArgumentParser()
 parser.add_argument('--force', default=False,
                     action="store_true",