[dhcp_relay] More detailed crafting and strict testing of OFFER and ACK packets #924
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The pull request sonic-net/sonic-buildimage#2919 which was merged into the 201811 branch sonic-buildimage will cause the dhcp_relay test to erroneously fail, due to minor changes in the relayed OFFER and ACK packets. A similar pull request is now open against the master branch of sonic-buildimage here: sonic-net/sonic-buildimage#2946. This change will ensure the dhcp_relay test works as expected after the aforementioned changes. This PR should be merged into master and cherry-picked into 201811.