Properly (de)serialize references in old mongo
LMS-11204
set root logging level for acceptance tests to ERROR
Auto enroll students even if there are multiple course modes

Add session middleware to an external auth test to fix a test failure with the auto-registration AB-test changes
Template changes for course track AB-test
Merge pull request #4824 from edx/will/auto-register

Auto enroll students even if there are multiple course modes
Sync children vertical names with group names in split test module.
Merge pull request #4853 from edx/christina/stud-2093

Add a request-token to identify which xblock html was rendered as part o...
Merge pull request #4838 from edx/clytwynec/remove_warnings_from_lettuce_test_logs

set root logging level for acceptance tests to ERROR
Merge pull request #4777 from edx/anton/sync-groups-and-verticals

Anton/sync groups and verticals
Instructor Dash: Display message when there are no tasks running

This commit adds a message to the instructor dashboard that is displayed when
no instructor tasks are currently running. This message is displayed where the
instructor pending tasks table would normally be placed, and is replaced
with the table when there are running tasks.
Merge pull request #4848 from Stanford-Online/njdupoux/no-pending-instructor-tasks

Instructor Dash: Display message when no tasks running
XML export maps keys into xml expected format
Merge pull request #4803 from edx/dhm/import_split_test

Dhm/import split test
Add ability to set staff lock from course outline
Merge pull request #4740 from edx/dan-ben/staff-lock-outline

Add ability to set staff lock from course outline
Translation & secure-aware changes to studio's settings page

1. Change the link of course's about page secure aware, which displays 'https' or 'http' prefix according to the current protocol.
2. Make the email in this page translatable.
Merge pull request #4867 from louyihua/localization-cms

Translation & secure-aware changes to studio's settings page
Move ContainerBase into base_studio_test.
Verify new test initially passes without bad content.
Verify test passes with wrong runtime.