[dhcp_relay] fix data type in dhcp6relay, add protection in packet data parsing #9036
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Why I did it
Error in socket receiver, causing dhcp6relay to be stuck in infinite while loop when parsing through packet data.
How I did it
Fix recv datatype, add a protection check to check if the next pointer of packet is the same as current pointer.
How to verify it
Which release branch to backport (provide reason below if selected)
Description for the changelog
A picture of a cute animal (not mandatory but encouraged)
Signed off by Kelly Yeh kellyyeh@microsoft.com