chore(net-analyzer/wireshark): Drop old wireshark package
add(net-analyzer/nmap): Add ncat to production builds.

Nmap itself is excluded, just want the basic network tools.
ncat is a netcat implementation with support for fun things like SSL.
In the future we could add nping but since we already include iputils
that is not quite as important as ncat.

The nmap ebuild includes a compile fix posted here:
https://bugs.gentoo.org/show_bug.cgi?id=501136
Merge pull request #355 from marineam/ncat

Ncat