MAINT: Remove unused setup from trading calendar test.

The values in the setup are unused in the test suite, so remove.

Also remove imports.

tests/test_tradingcalendar.py

@@ -21,17 +21,11 @@ from zipline.utils import tradingcalendar_bmf
 import pytz
 import datetime
 from zipline.finance.trading import TradingEnvironment
-import pandas as pd
-from pandas import DatetimeIndex
 from nose.tools import nottest
 
 
 class TestTradingCalendar(TestCase):
 
-    def setUp(self):
-        today = pd.Timestamp('today', tz='UTC')
-        self.end = DatetimeIndex([today])
-
     @nottest
     def test_calendar_vs_environment(self):
         """