#1367 Add Python3 support

[Josef Ridky]

In near future, Python 2 in Fedora will be marked as obsolete and removed from the system and Python 3 will become the only supported Python interpreter.

Due of this, it would be great, if Net-SNMP will support Python 3 as well (or as default python interpreter ?).

I have tried to port Python 2 code to Python 3 (see attached patch).

Please, let me know, what do you think about it. What should be modified/added/removed before apply to master branch.