zbreplay includes FCS (using RZUSBStick)

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What steps will reproduce the problem?
1. Apply zbreplay

What is the expected output? What do you see instead?
The firmware of the RZUSBStick adds an additional FCS field despite the fact 
that a pcap file already includes the FCS field. Therefore the injected packet 
has two FCS fields

What version of the product are you using?
[ ] KillerBee 1.0 (from TAR file)
[X] KillerBee beta (from SVN checkout) Revision # 99
[ ] Other:

On what operating system?
Ubuntu 14.04

With what Python version? (python -V)
2.7.6

Is scapy-com installed?
yes

Please provide any additional information below.
The last two bytes (FCS) of packets read by PcapReader should be removed before 
the packets will be injected.

Original issue reported on code.google.com by Norman.G...@googlemail.com on 6 Mar 2015 at 12:37