* Update migration sharness tests for new migrations
With the new migrations, go-ipfs no longer uses fs-repo-migrations to do repo migrations, and was downloading real migration binaries from the network and running them. This caused failure, but was not caught because the test was expecting `ipfs daemon --migrate` to fail for other reasons.
This PR fixes the migration tests by creating the appropriate fake migration binaries in the PATH so that those get run and avoid downloading the real ones. This also fixes a test that was previously marked broken.
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