[sr-dev] [kamailio/kamailio] presence: limit the number of subscriptions handled in timer_dbonly (#1609)

[lazedo]

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#### Type Of Change
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- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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#### Description
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due to the way update_db_subs_timer_dbonly handles the query to the
database (getting all records), if for some reason a burst of
terminating subscriptions occurs, most likely there will be no package
memory to process all expiring subscriptions.

this commit uses the same pattern as other routines in presence by using
db_fetch_query with fetch_rows parameter module.

because we create the subs in the loop and then call handle_expired_subs
to avoid locking issues the subscription should already be deleted from
the database when it returns from handle_expired_subs, there's no reason
to issue the last delete, and that was removed.
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1609

-- Commit Summary --

  * presence: limit the number of subscriptions handled in timer_dbonly

-- File Changes --

    M src/modules/presence/subscribe.c (41)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1609.patch
https://github.com/kamailio/kamailio/pull/1609.diff

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