make snapshot check strategy simpler and still correct #1709
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via @mikaelene in #1614 (comment)
The snapshot check strategy that dbt used in 0.14.1 pre-releases was unduly complex. We can simplify this logic while still preserving the correctness of
dbt snapshotwhen thecheckstrategy is specified. Further, the approach shown here should be faster than the previous implementation because we can avoid a potentially costly subquery.