[bitshares/bitshares-core] Fix tests (#1126)

Thanks. Boost 1.66+ is known to have issues with current object database and/or undo database implementation. I believe not only these two test cases are affected. More discussions:
* https://github.com/bitshares/bitshares-fc/pull/36#issuecomment-381588452
* https://github.com/bitshares/bitshares-core/issues/852

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