[sr-dev] [kamailio/kamailio] pua: different behavior depending on db_mode (#2414)

[Juha Heinanen]

Victor Seva writes:

> I cannot be sure 100% but from what I understand if you set etag... it has the same behavior than previously.
> If is the first PUBLISH, there's no record, so no changes in logic.
> 
> Change is merged already do you detect any regression?

I can test when the merge is backported to 5.4, since I don't at present
have a live master system.