Samuel Jero 31e16f57b1 Secure LLDP-based Topology Detection
Current LLDP/BDDP-based Topology Detection is vulnerable to the
creation of fake links via forged, modified, or replayed LLDP packets.
This patch fixes this vulnerability by authenticating LLDP/BDDP packets
using a Message Authentication Code and adding a timestamp to prevent
replay. We use HMAC with SHA-256 has our Messge Authentication Code and
derive the key from the config/cluster.json file via the
ClusterMetadata class.

Change-Id: I01dd6edc5cffd6dfe274bcdb97189f2661a6c4f1
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