Make data-dir explicit for pa11ycrawler

pavelib/paver_tests/test_paver_bok_choy_cmds.py

@@ -209,6 +209,8 @@ class TestPaverPa11yCrawlerCmd(unittest.TestCase):
             "port=8003",
             "-a",
             "course_key=course-v1:edX+Test101+course",
+            "-a",
+            "data_dir=/edx/app/edxapp/edx-platform/reports/pa11ycrawler/data",
         ]
         self.assertEqual(suite.cmd, expected_cmd)
 

pavelib/utils/test/suites/bokchoy_suite.py

@@ -394,6 +394,7 @@ class Pa11yCrawler(BokChoyTestSuite):
         """
         Runs pa11ycrawler as staff user against the test course.
         """
+        data_dir = os.path.join(self.report_dir, 'data')
         return [
             "scrapy",
             "crawl",
@@ -402,4 +403,6 @@ class Pa11yCrawler(BokChoyTestSuite):
             "port=8003",
             "-a",
             "course_key={key}".format(key=self.course_key),
+            "-a",
+            "data_dir={dir}".format(dir=data_dir)
         ]