centos 7 bpf fix
centos 7 bpf fix

xuzhaokui/PF_RING,ntop/PF_RING,ntop/PF_RING,rgv151/PF_RING,opencTM/PF_RING,ntop/PF_RING,opencTM/PF_RING,xuzhaokui/PF_RING,opencTM/PF_RING,rgv151/PF_RING,ntop/PF_RING,xuzhaokui/PF_RING,zhongpei/PF_RING,ntop/PF_RING,zhongpei/PF_RING,zhongpei/PF_RING,opencTM/PF_RING,xuzhaokui/PF_RING,zhongpei/PF_RING,rgv151/PF_RING,ntop/PF_RING,rgv151/PF_RING,ntop/PF_RING