Revert changes fixed in #1235

Author: pervazea

test/sql/insert_sql_test.cpp

@@ -598,7 +598,6 @@ TEST_F(InsertSQLTests, BadTypes) {
   query = "INSERT INTO foo(id5) VALUES('h');";
   EXPECT_THROW(TestingSQLUtil::GeneratePlanWithOptimizer(optimizer, query, txn),
                peloton::Exception);
-  txn_manager.CommitTransaction(txn);  
 
   // free the database just created
   txn = txn_manager.BeginTransaction();
@@ -619,7 +618,6 @@ TEST_F(InsertSQLTests, NonExistentTable) {
   txn = txn_manager.BeginTransaction();
   EXPECT_THROW(TestingSQLUtil::GeneratePlanWithOptimizer(optimizer, query, txn),
                peloton::CatalogException);
-  txn_manager.CommitTransaction(txn);  
 }
 
 }  // namespace test