Update test_engine to account for key column being inserted when btables are created.
Update test_engine to account for key column being inserted when btables are created.

JDReutt/BayesDB,JDReutt/BayesDB,poppingtonic/BayesDB,poppingtonic/BayesDB,JDReutt/BayesDB,poppingtonic/BayesDB,poppingtonic/BayesDB,JDReutt/BayesDB,poppingtonic/BayesDB,JDReutt/BayesDB