Add kernel timestamping on ICMP ECHO-REPLY #77
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On linux, add the SO_TIMESTAMPNS socket option on the socket level.
This option allows us to use the kernel packet timestamping feature. When the ICMP packet is received, the kernel put a timestamp that the program is able to read. This timestamp is more accurate than program timestamp because it is impacted by the process switching.
This patch fix the the ping precision on system with many processes.