syn.lua: reset connection after receiving the SYN+ACK
syn.lua: reset connection after receiving the SYN+ACK

On Linux this is handled by the kernel itself (unless RST sending is blocked
with e.g. the iptables rule for banner.lua), but that's not the case on other
operating systems.

ghedo/pktizr,ghedo/pktizr,ghedo/pktizr