Enable non zero round BFT bootstrap

[adetokunbo]

Fixes #6110

This is stacked on #6000 which contains the fix for the title portion of #6110
The is PR addresses the extended portion mentioned in this comment

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[adetokunbo]

@dfordivam PTAL

Note that the new test runs quickly, faster than TrafficBasedRewardsTimeBasedIntegrationTest

Although it specifically tests the behavior in the presence of an extra SV, isn't it also covering the basic BFT multi-SV functionality that that test currently checks?

If so, to reduce overall integration testing latency, (and thereby reduce the chance of future flakes), should this PR also switch TrafficBasedRewardsTimeBasedIntegrationTest back to being a single SV test?