Token based access control for leaf node maintenance

[alexttx]

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Signed-off-by: Alex Tomlinson [email protected]

[beckerg]

Can you wire it up and run a bunch of various tests, kmt, ycsb, mongo?

[beckerg]

I'll review this after I see it working well in-situ...

[tristan957]

This approach seemed pretty interesting. Sucks to see it closed.

[beckerg]

We should revisit it after we have the join synchronization in place, which I think will be more complicated because we'll need to keep spill out of two nodes, probably..