the method to get SOCKET HANDLE from Snmp

[zhengqiang 27012]

Hello.

The Snmp session class Snmp maintains the communication SOCKET. There is a
"protected" member: iv_snmp_session, which holds the handle of socket.

But without any method, we can not get this handle.

Shall we have this function in next version of SNMP++, or just a "public" member.

Also, "protected" member iv_notify_fd.
Though, it can be obtained vai eventListHolder->notifyEventList()->get_notify_fd().


Best regards.