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5cb8f8a622
Extend QUIC transport emission function to support a maximum datagram argument. The purpose is to ensure that qc_send() won't emit more than the specified value, unless it is 0 which is considered as unlimited. In qc_prep_pkts(), a counter of built datagram has been added to support this. The packet building loop is interrupted if it reaches a specified maximum value. Also, its return value has been changed to the number of prepared datagrams. This is reused by qc_send() to interrupt its work if a specified max datagram argument value is reached over one or several iteration of prepared/sent datagrams. This change is necessary to support pacing emission. Note that ideally, the total length in bytes of emitted datagrams should be taken into account instead of the raw number of datagrams. However, for a first implementation, it was deemed easier to implement it with the latter.