#883 mod_groups leaks modified roster with storage other than internal
What steps will reproduce the problem?
1. Configure a host with mod_groups and storage other than 'internal'
2. Connect to an account in one of the groups.
3. Modify the roster in some way that causes a write (eg change nickname)
What is the expected output? What do you see instead?
mod_groups items should not end up in storage, but they do.
(I did not actually test this.)