[sr-dev] [kamailio] Implement load and restore of contact attributes (#178)

[Juha Heinanen]

Hugh Waite writes:

> The tm module parameters 'contacts_avp' and 'contact_flows_avp' are
> populated when the t_load_contacts() function is called. These store
> the data from the branch structures but, before my changes, did not
> know anything about the attributes loaded by usrloc.

thanks for your explanation.  by usrloc attributes you mean all the
fields of location table?

-- juha