automove script: improve algo, add basic test

added a devtools/slab_loadgen script for some basic testing of load patterns.

can easily add more features (typical variance/reads/inline reload/etc) to
further tune algo but was helpful enough as-is. Was able to restart the
program with changed configs and watch rebalancer fix itself.

rebalancer algo is now much better at pulling slab classes closer together and
not ping-ponging, which previous version was doing even with a steady state of
sets.

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