Initializes the ratectl for a node when the state is changed to RUN. This prevents a kernel fault by dividing with zero because the initial rate was 0 and didn't be initialized.
Initializes the ratectl for a node when the state is changed to RUN.
This prevents a kernel fault by dividing with zero because the initial
rate was 0 and didn't be initialized.

Tested by:	Warren Block <wblock at wonkity.com>
MFC after:	3 days

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