Changeset 9154:dc6216aee85c
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PacketQueue: Allow queuing in the same tick as desired send tick

This patch allows packets to be enqueued in the same tick as they are
intended to be sent. This does not imply they actually are sent that
tick, although that is possible.

This change is useful for module that use the queued ports primarly to
avoid handling the flow control involved in sending and retrying
packets.

util/regress all passing (disregarding t1000 and eio)