[SR-Users] rls does not generally work

[Juha Heinanen]

it turned out that presence rls module does not work unless pua module
is configured to use database mode and database is postgre.  the issue
is serious, since besides not working, it makes presence/rls server not
to accept any new requests.

since there is no easy cure, should i go and write a warning in rls
readme file so that others don't stumble on this?

-- juha