* Try up-allocation on neutral trend.
Some probes end up with neutral trend due to getting much estimates of
same value. It is okay to try up-allocating in those cases. Otherwise,
the stream allocator some times gets stuck and does not up-allocate at
all as all probes end up neutral.
Changing the name of the signal to `NotCongesting` to signify it is
either neutral or clearing.
* wait 5 RTT for probe to finalize
* trend detector object encoder
Raja Subramanian