MLE: set port speeds for non user-specified segment/path endpoint interfaces.
We now make a pass through the implemented_by tree setting port speeds that the user left up to assign (i.e., that are 0). We start at the lowest level links and assign default speeds. Then the speed values for the start and end segments for each path get propagated to the link being implemented by the path. Should be pretty generic for any number of layers. We warn if the higher level links don't support those speed settings (if they don't, we're gonna have a problem; but I think assign protects this from happening).
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