Redis backend

I introduced Redis support for store information about attacks.

Please call redis-cli and input following commands

keys *
1) "10.10.10.200_flow_dump"
2) "10.10.10.200_information"
3) "10.10.10.200_packets_dump"

Basic information about attack (stored immediately) get 10.10.10.200_information

Complete flow dump for attack if flow tracking enabled (stored immediately) get 10.10.10.200_flow_dump

Complete per packet attack dump (stored with some delay; can be absent in some cases of slow attacks) get 10.10.10.200_packets_dump