Shall be no functional change for normal SNMP sends, e.g. replies and
traps.
NB: for the inet_send() called from snmp_send_port() we now actually use
supplied address, but we could do a better job at finding matching socket.
However, it could be that snmp_send_port() is not used by any external
module, and in that case it is easier to just deprecate it as poorly
fitting design of the server. This will be checked with exp-run.