net/tcpkali: remove port

Upstream was originally hosted on a github organisation named
satori-com, which was at some point renamed to machinezone, leaving
the port working with a redirect. Later, somebody grabbed the
satori-com github handle and created a repository with the tcpkali name,
breaking the redirect. This new repository is empty except for a file
named the same as tcpkali's main documentation file, holding a
suspicious shell command.

While the tarball we attempt to fetch is long gone, it is still in our
cache and thus building the port succeeds for now. Our local port does
not seem like it was compromised in any way.

Neverthless, remove this port to avoid this confusing situation
entirely. Upstream is gone and some fishy things are happening.

Reported by: danilo, des