Remove broken management command

Also remove tests that weren't getting run.

lms/djangoapps/instructor/management/commands/compute_grades.py

-#!/usr/bin/python
-"""
-django management command: dump grades to csv files
-for use by batch processes
-"""
-from django.http import Http404
-from django.core.management.base import BaseCommand
-
-from courseware.courses import get_course_by_id
-from lms.djangoapps.instructor.offline_gradecalc import offline_grade_calculation
-from opaque_keys import InvalidKeyError
-from opaque_keys.edx.keys import CourseKey
-from opaque_keys.edx.locations import SlashSeparatedCourseKey
-
-
-class Command(BaseCommand):
-    help = "Compute grades for all students in a course, and store result in DB.\n"
-    help += "Usage: compute_grades course_id_or_dir \n"
-    help += "   course_id_or_dir: space separated list of either course_ids or course_dirs\n"
-    help += 'Example course_id: MITx/8.01rq_MW/Classical_Mechanics_Reading_Questions_Fall_2012_MW_Section'
-
-    def add_arguments(self, parser):
-        parser.add_argument('course_id_or_dir', nargs='+')
-
-    def handle(self, *args, **options):
-
-        print "options = ", options
-
-        try:
-            course_ids = options['course_id_or_dir']
-        except KeyError:
-            print self.help
-            return
-        course_key = None
-        # parse out the course id into a coursekey
-        for course_id in course_ids:
-            try:
-                course_key = CourseKey.from_string(course_id)
-            # if it's not a new-style course key, parse it from an old-style
-            # course key
-            except InvalidKeyError:
-                course_key = SlashSeparatedCourseKey.from_deprecated_string(course_id)
-            try:
-                get_course_by_id(course_key)
-            except Http404 as err:
-                print "-----------------------------------------------------------------------------"
-                print "Sorry, cannot find course with id {}".format(course_id)
-                print "Got exception {}".format(err)
-                print "Please provide a course ID or course data directory name, eg content-mit-801rq"
-                return
-
-            print "-----------------------------------------------------------------------------"
-            print "Computing grades for {}".format(course_id)
-
-            offline_grade_calculation(course_key)

lms/djangoapps/instructor/management/tests/test_compute_grades.py

-# coding=utf-8
-
-"""Tests for Django instructor management commands"""
-
-from unittest import TestCase
-
-from django.core.management import call_command
-from mock import Mock
-
-from lms.djangoapps.instructor.offline_gradecalc import offline_grade_calculation  # pylint: disable=unused-import
-from opaque_keys.edx.keys import CourseKey
-from opaque_keys.edx.locator import CourseLocator
-
-
-class InstructorCommandsTest(TestCase):
-    """Unittest subclass for instructor module management commands."""
-
-    def test_compute_grades_command(self):
-        course_id = 'MITx/0.0001/2016_Fall'
-        offline_grade_calculation = Mock()  # pylint: disable=redefined-outer-name
-        CourseKey.from_string = Mock(return_value=CourseLocator(*course_id.split('/')))
-        call_command('compute_grades', )
-        self.asertEqual(offline_grade_calculation.call_count, 1)  # pylint: disable=no-member
-        offline_grade_calculation.assert_called_with(CourseKey.from_string('MITx/0.0001/2016_Fall'))
-
-    def test_compute_grades_command_multiple_courses(self):
-        course_id1 = 'MITx/0.0001/2016_Fall'
-        course_id2 = 'MITx/0.0002/2016_Fall'
-        CourseKey.from_string = Mock()
-        offline_grade_calculation = Mock()  # pylint: disable=redefined-outer-name
-        call_command('compute_grades', '{0} {1}'.format(course_id1, course_id1))
-        self.asertEqual(offline_grade_calculation.call_count, 2)  # pylint: disable=no-member
-        CourseKey.from_string.assert_called_with(course_id1)
-        CourseKey.from_string.assert_called_with(course_id2)