Bug#724738: sflowtool: changing from RFP to ITP

[Rowan Thorpe <rowan@rowanthorpe.com>]

Oops, after 3 years I just noticed that the link I sent in the
previous email was wrong (to the repository I put on github in the
hopes of being helpful despite the lack of Debian Official uptake).
The correct one is (a gbp repo):

 https://github.com/rowanthorpe/sflowtool-debian

Anyway, that is still based on a very old upstream version, but
because the packaging framework is in place it would be relatively
easy to sync it with the latest upstream version, if anyone ever
indicates they would find it useful.