Permission handling in external function

This move the setting of user and group permissions in the startup
script to its own function.

startup_scripts/startup_script_utils/permissions.py

@@ -0,0 +1,18 @@
+from django.contrib.auth.models import Permission
+
+
+def set_permissions(subject, permission_filters):
+  if subject is None or permission_filters is None:
+    return
+  subject.clear()
+  for permission_filter in permission_filters:
+    if "*" in permission_filter:
+      permission_filter_regex = "^" + permission_filter.replace("*", ".*") + "$"
+      permissions = Permission.objects.filter(codename__iregex=permission_filter_regex)
+      print("  ⚿ Granting", permissions.count(), "permissions matching '" + permission_filter + "'")
+    else:
+      permissions = Permission.objects.filter(codename=permission_filter)
+      print("  ⚿ Granting permission", permission_filter)
+
+    for permission in permissions:
+      subject.add(permission)