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Device initiate connection t0, tcp syn/ack;
Openflow protocol exchanges:
t0 -> ONOS OVS Features Reply;
OVS Features Reply -> ONOS Role Request; (ONOS processing of mastership election for the device happens here)
ONOS Role Request -> OVS Role Reply - completes the initial OF protocol exchanges;
ONOS core processing of the event:
A Device Event is triggered upon OF protocol exchange completes;
A Topology (Graph) Event is triggered from the local node Device Event.
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Similar to the switch-connect test, we consider the latest node in the cluster having registered the Graph event as the latency for the cluster.
