Clean up some unused imports.

(imported from commit 0c5d8e2a55ba1b8909ba807fee3afe863dcdc226)

bots/irc-mirror.py

@@ -10,9 +10,7 @@ import irc.bot
 import irc.strings
 from irc.client import ip_numstr_to_quad, ip_quad_to_numstr
 import zulip
-import time
 import optparse
-import sys
 
 def zulip_sender(sender_string):
     nick = sender_string.split("!")[0]

bots/process_ccache

@@ -1,6 +1,5 @@
 #!/usr/bin/python
 import sys
-import os
 import subprocess
 import base64
 

integrations/codebase/zulip_codebase_mirror

@@ -31,7 +31,6 @@
 
 import requests
 import logging
-import calendar
 import time
 import sys
 import os