Add support for CDC_WRITE_FAILURE and CAS_WRITE_UNKNOWN error codes

[adutra]

Protocol v5 defines two additional error codes in the 1.x series that are currently not handled at all:

0x1600    CDC_WRITE_FAILURE: // todo
0x1700    CAS_WRITE_UNKNOWN: An exception occured due to contended Compare And Set write/update.
          The CAS operation was only partially completed and the operation may or may not get completed by
          the contending CAS write or SERIAL/LOCAL_SERIAL read. The rest of the ERROR message body will be
            <cl><received><blockfor>
          where:
            <cl> is the [consistency] level of the query having triggered
                 the exception.
            <received> is an [int] representing the number of nodes having
                       acknowledged the request.
            <blockfor> is an [int] representing the number of replicas whose
                       acknowledgement is required to achieve <cl>.