Add DynamoDB marshaling update test (#4746)
Add DynamoDB marshaling update test (#4746)

This test fails before the d3604289be99 update.
joelthompson/vault,kingland/vault,hashicorp/vault,hashicorp/vault,kingland/vault,hartsock/vault,hartsock/vault,hashicorp/vault,quixoten/vault,quixoten/vault,rnaveiras/vault,rnaveiras/vault,rnaveiras/vault,hartsock/vault,rnaveiras/vault,hartsock/vault,hashicorp/vault,quixoten/vault,kingland/vault,joelthompson/vault,kingland/vault,joelthompson/vault,kingland/vault,joelthompson/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,hartsock/vault,quixoten/vault