net/pcapy-ng: Add new port

Pcapy is a Python extension module that interfaces with the libpcap packet
capture library. Pcapy enables Python scripts to capture packets on the network.

Pcapy is highly effective when used in conjunction with a packet-handling
package such as Impacket, which is a collection of Python classes for
constructing and dissecting network packets.

WWW: https://github.com/CoreSecurity/pcapy
WWW: http://www.coresecurity.com/corelabs-research/open-source-tools/pcapy

PR: 260732