Enabling Active Response

This enables active responses (snort will send TCP RST or ICMP unreachable/port) when dropping a session.

    ./configure --enable-active-response / -DACTIVE_RESPONSE

    preprocessor stream5_global: \
        max_active_responses <max_rsp>, \
        min_response_seconds <min_sec> 

    <max_rsp> ::= (0..25)
    <min_sec> ::= (1..300)

Active responses will be encoded based on the triggering packet. TTL will be set to the value captured at session pickup.