Add reading live-updating .pcap file as it's getting updated.

[vadimszzz]

I have .pcap file that is updating. I want to parse it like a stream.

[vadimszzz]

Found packet_streamer.PacketStreamer(iface_name="file.pcap")

[vadimszzz]

Does packet_streamer.PacketStreamer("liveupdating.pcap") works as I expect?

chains/chains/sources/packet_streamer.py

Lines 65 to 70 in e4f80f4

	def read_interface(self):
	"""Read Packets from the packet capture interface"""
	# Spin up the packet capture
	if self._iface_is_file():
	self.pcap = pcapy.open_offline(self.iface_name)

- One time reading or live?