do some lamda magic to refactor out the whitelist checking code to be shared between LMS and CMS

common/djangoapps/util/sandboxing.py

@@ -0,0 +1,11 @@
+import re
+from django.conf import settings
+
+
+def can_execute_unsafe_code(course_id):
+    # To decide if we can run unsafe code, we check the course id against
+    # a list of regexes configured on the server.
+    for regex in settings.COURSES_WITH_UNSAFE_CODE:
+        if re.match(regex, course_id):
+            return True
+    return False