Remove errant copy of test_download_csv.py

It was added to 2 different locations by mistake.

lms/djangoapps/instructor/test_download_csv.py

-"""
-Unit tests for instructor dashboard
-
-Based on (and depends on) unit tests for courseware.
-
-Notes for running by hand:
-
-django-admin.py test --settings=lms.envs.test --pythonpath=. lms/djangoapps/instructor
-"""
-
-from django.test.utils import override_settings
-
-# Need access to internal func to put users in the right group
-from django.contrib.auth.models import Group
-
-from django.core.urlresolvers import reverse
-
-from courseware.access import _course_staff_group_name
-from courseware.tests.tests import LoginEnrollmentTestCase, TEST_DATA_XML_MODULESTORE, get_user
-from xmodule.modulestore.django import modulestore
-import xmodule.modulestore.django
-
-
-@override_settings(MODULESTORE=TEST_DATA_XML_MODULESTORE)
-class TestInstructorDashboardGradeDownloadCSV(LoginEnrollmentTestCase):
-    '''
-    Check for download of csv
-    '''
-
-    def setUp(self):
-        xmodule.modulestore.django._MODULESTORES = {}
-
-        self.full = modulestore().get_course("edX/full/6.002_Spring_2012")
-        self.toy = modulestore().get_course("edX/toy/2012_Fall")
-
-        # Create two accounts
-        self.student = 'view@test.com'
-        self.instructor = 'view2@test.com'
-        self.password = 'foo'
-        self.create_account('u1', self.student, self.password)
-        self.create_account('u2', self.instructor, self.password)
-        self.activate_user(self.student)
-        self.activate_user(self.instructor)
-
-        def make_instructor(course):
-            group_name = _course_staff_group_name(course.location)
-            g = Group.objects.create(name=group_name)
-            g.user_set.add(get_user(self.instructor))
-
-        make_instructor(self.toy)
-
-        self.logout()
-        self.login(self.instructor, self.password)
-        self.enroll(self.toy)
-
-    def test_download_grades_csv(self):
-        course = self.toy
-        url = reverse('instructor_dashboard', kwargs={'course_id': course.id})
-        msg = "url = {0}\n".format(url)
-        response = self.client.post(url, {'action': 'Download CSV of all student grades for this course'})
-        msg += "instructor dashboard download csv grades: response = '{0}'\n".format(response)
-
-        self.assertEqual(response['Content-Type'], 'text/csv', msg)
-
-        cdisp = response['Content-Disposition']
-        msg += "Content-Disposition = '%s'\n" % cdisp
-        self.assertEqual(cdisp, 'attachment; filename=grades_{0}.csv'.format(course.id), msg)
-
-        body = response.content.replace('\r', '')
-        msg += "body = '{0}'\n".format(body)
-
-        # All the not-actually-in-the-course hw and labs come from the
-        # default grading policy string in graders.py
-        expected_body = '''"ID","Username","Full Name","edX email","External email","HW 01","HW 02","HW 03","HW 04","HW 05","HW 06","HW 07","HW 08","HW 09","HW 10","HW 11","HW 12","HW Avg","Lab 01","Lab 02","Lab 03","Lab 04","Lab 05","Lab 06","Lab 07","Lab 08","Lab 09","Lab 10","Lab 11","Lab 12","Lab Avg","Midterm","Final"
-"2","u2","Fred Weasley","view2@test.com","","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"
-'''
-
-        self.assertEqual(body, expected_body, msg)
-
-
-