Introduce user space conntrack tool

[Pablo Neira <pablo@eurodev.net>]

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I've started a tool to do common manipulation conntrack. Please, it is 
*very* raw yet, it still need work but I think that it could be 
interesting. Of course, it requires libctnetlink and libnfnetlink.

An overview:

o List conntrack table

      $ conntrack -L conntrack

(Better that cat'ing /proc/net/ip_conntrack all day which is known to 
harm performance)

o Get a conntrack

      $ conntrack -G conntrack --reply-src 85.136.102.173 \
        --reply-dst 66.111.58.51 -p tcp --reply-port-src 44843 \
        --reply-port-dst 993 -i 13

o Delete a conntrack

      $ conntrack -D conntrack --reply-src 85.136.102.173 \
        --reply-dst 66.111.58.51 -p tcp --reply-port-src 44843 \
        --reply-port-dst 993 -i 13

o Create a conntrack

      $ conntrack -I conntrack --orig-src 1.1.1.4 --orig-dst 2.2.2.3 \
      --reply-src 2.2.2.3 --reply-dst 1.1.1.4 -p tcp --orig-port-src 20 \
      --orig-port-dst 10 --reply-port-src 10 --orig-port-dst 20 \
      -u ASSURED -t 100

o Flush conntrack table (not implemented)
o Display events

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