Created SCPFmastershipFailoverLat test

Change-Id: I9610a17a8d4f0ccb6a83b27679a9d20efed93f25
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+The objective of SCPFmastershipFailoverLat is to test the latency for an ONOS node being killed, change of mastership, and role request as ONOS scales.
+For more details, check out the wiki documentation: https://wiki.onosproject.org/x/O4De
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