empty conf on start if not present
empty conf on start if not present

ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,ntop/PF_RING,ntop/PF_RING,opencTM/PF_RING,opencTM/PF_RING,ntop/PF_RING