Benjamin Valentin 3b40ca2b26 shell/gnrc_icmpv6_echo: test for ICMPv6 echo reply corruption
The Linux ping utility has the nice feature that fills the ICMPv6 echo
request payload with a pattern `payload_index & 0xFF`.
Then the ICMPv6 echo response payload is checked to verify that the pattern
is still intact.

This way corrupted messages can be detected.
In the past that revealed some 6lo-fragmentation bugs in Linux when
corrupted replies arrived.

This feature is also useful for RIOT, so implement it in RIOTs `ping`
command.
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