fix index backed blockstore panic by simplifying locking #147
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Fixes root cause of filecoin-project/boost#1134
In this PR I've replaced the complex locking mechanism in IndexBackedBlockstore with a striped lock, so as to eliminate the possibility of a nil blockstore.
Note that it's easiest to view changes with whitespace diff turned off:
https://github.com/filecoin-project/dagstore/pull/147/files?diff=unified&w=1