pfring pkt acq: keep running on 'pfring_set_cluster' failure when cluster is not...

pfring pkt acq: keep running on 'pfring_set_cluster' failure when cluster is not required

Suricata creates a pfring cluster with a default ID = 1 when not explicitly configured,
unless the device has prefix 'dna' or 'zc'. Since pf_ring also supports other cards
implementing kernel-bypass (cluster not supported), this is preventing those cards from
running on top of this module. This patch stops suricata on 'pfring_set_cluster' failure
only when error code != PF_RING_ERROR_NOT_SUPPORTED or cluster ID has not been explicitly
configured.