Implement the missing part of Exchange Header in Transport layer

[yufengwangca]

Problem

Currently, only I Flag (A single bit field indicating that the message was sent by the initiator of the exchange) is implemented in transport layer. Vendor Id is implemented in the Payload part but its flag is implemented in the Packet part, this cause, the payload header need to be passed through the transport stack.

Proposed Solution

1. Add support for the following two flags in Exchange Header (8 bits)

A Flag (1 bit, position 1)
A single bit field indicating that the message serves as an acknowledgement of a previous message
received by the current message sender.

R Flag (1 bit, position 2)
A single bit field indicating that the message sender wishes to receive an acknowledgement for the
message.

2. Move V flag from Packet Header to Payload Header

V Flag (1 bit, position 4)
A single bit field indicating whether a Vendor Id is prepended to the Message Protocol Id field.

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