Some import cleanup

(imported from commit 265cebb011309b9a880035ccd587a5e51554803a)

api/common.py

@@ -3,7 +3,6 @@ import simplejson
 import requests
 import time
 import traceback
-from os import path
 
 # Check that we have a recent enough version
 assert(requests.__version__ > '0.12')

zephyr/models.py

@@ -7,9 +7,7 @@ import calendar
 from zephyr.lib.cache import cache_with_key
 import fcntl
 import os
-import re
 import simplejson
-import datetime
 from django.db import transaction
 from zephyr.lib import bugdown