NOT11 — We need default value for DiscardPolicy

Summary: In the spec we define the DiscardPolicy QoS property, and the various
settings it can take on. But, we don"t define what the behavior is
when the property is not set, and we don"t define a value of NONE that
can be used to disable the DiscardPolicy after it has been set.
My proposal is to define a new value, say NoOrder, which is the default
value and means that DiscardPolicy is disabled, so attempts to send events
to the channel when the buffer is full will fail, rather than have events
already in the buffer be discarded.

As a related issue, we may also want to define a DiscardInterval, so that
if DiscardPolicy does kick in, the algorithm can select more than one
event from the buffer to discard. This would prevent the channel from
thrashing between executing its discard algorithm, and receiving new events.
I"d be interested in comments about this idea, in addition to the proposal
to define the NoOrder value for DiscardPolicy.

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