Module to identifies open Chargen service
fix match and boolean expression
fixed some things, as suggested by jvazquez-r7
used the recvfrom timeout
Clean chargen_probe
Merge pull request #1 from jvazquez-r7/review-2681

Clean chargen_probe
Add chargen to udp_probe and udp_sweep

This simplifies the checks considerably for PR #2681 from @mcantoni
Downcase chargen service name
Merge pull request #2 from todb-r7/simplify-chargen-detection

Add chargen to udp_probe and udp_sweep
Fix udp_probe
Fix udp_sweep
Land #2681, @mcantoni and @todb-r7's support for chargen