sendmsg()/recvmsg() based socket communication what could be used,
among other things, in the context of a transparent SNMP proxy
application. Technically, the following features were brought
into pysnmp with this update:
* Sending SNMP packets from a non-local IP address
* Receiving IP packets for non-local IP addresses
* Responding to SNMP requests from exactly the same IP address
the query was sent to. This proves to be useful when listening
on both primary and secondary IP interfaces.