Merge branch 'lab-api-refactor' into dev

Author: rayluo

tests/test_e2e.py

@@ -551,6 +551,8 @@ def get_lab_user_secret(cls, lab_name="msidlab4"):
     def get_lab_user(cls, **query):  # https://docs.msidlab.com/labapi/userapi.html
         resp = cls.session.get("https://msidlab.com/api/user", params=query)
         result = resp.json()[0]
+        assert result.get("upn"), "Found no test user but {}".format(
+            json.dumps(result, indent=2))
         _env = query.get("azureenvironment", "").lower()
         authority_base = {
             "azureusgovernment": "https://login.microsoftonline.us/"