Revert "Enable LMS sysadmin dashboard by default"

This reverts commit 90c5842.

Turns out that the sysadmin dashboard is slated for deprecation. It is
currently impossible to download the list of users in csv (see
https://discuss.overhang.io/t/tutor-10-0-11-sysadmin-feature-generates-500-error/776/4).
We should not attempt to resolve this issue.

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 Note: Breaking changes between versions are indicated by "💥".
 
+## Unreleased
+
+- [Feature] Get rid of outdated sysadmin dashboard in LMS at /sysadmin
+
 ## v10.1.0 (2020-07-23)
 
 - [Security] Apply edx-platform upstream xss security fixes ([pull request](https://github.com/edx/edx-platform/pull/24568))

tutor/templates/apps/openedx/config/lms.env.json

@@ -18,7 +18,6 @@
     "ENABLE_GRADE_DOWNLOADS": true,
     "ENABLE_MOBILE_REST_API": true,
     "ENABLE_OAUTH2_PROVIDER": true,
-    "ENABLE_SYSADMIN_DASHBOARD": true,
     "ENABLE_THIRD_PARTY_AUTH": true
   },
   "LMS_ROOT_URL": "{{ "https" if ACTIVATE_HTTPS else "http" }}://{{ LMS_HOST }}",

tutor/templates/apps/openedx/settings/partials/common_all.py

@@ -17,7 +17,7 @@
 
 # Load module store settings from config files
 update_module_store_settings(MODULESTORE, doc_store_settings=DOC_STORE_CONFIG)
-DATA_DIR = path("/openedx/data/")
+DATA_DIR = "/openedx/data/"
 for store in MODULESTORE["default"]["OPTIONS"]["stores"]:
    store["OPTIONS"]["fs_root"] = DATA_DIR