Miner Migration for V15 network upgrade

a detailed explanation of what we plan to do is described in:

Test the nv15 miner migration · Issue #1554 · filecoin-project/specs-actors

nv15 is expected to have migrations for the miner, market, and verifreg. The miner has the most involved migration, relying on some new logic, and so needs some thorough testing. Create an interesting v6 state tree a large number of mine...

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and

Draft: Migration test for miner actor by geoff-vball · Pull Request #1568 · filecoin-project/specs-actors

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