[spp] 3 bugs for spp_pcap

[Yasufumi Ogawa]

Hi Hideyuki,

Is there any reason you do not link liblz4.a with `-l` option? In the Makefile[1], althoogh you add this library to `SRCS-y`, I 
do not think it is better to use `-l`. What do you think?

[1] http://git.dpdk.org/apps/spp/tree/src/pcap/Makefile

Thanks,
Yasufumi

> Hi,
> 
> I found the following bugs for spp_pcap.
> 
> 1. Some packets can not be captured after pcap start.
> 
> 2. Packet drop happens when receiving 64 byte short packet on 10Gbps
> wire rate.
> 
> 3. On receiving pcap stop command, packets are not flushed to files.
> So when repeat capturing without shutdown of spp_pcap,
> old packets are included in the capture file.
> 
> I will fix those bugs and report patches to this ML.
> 
> Sorry for inconvenience.
> 
> BR,
> Hideyuki Yamashita
> NTT TechnoCross
>