Commits on Mar 3, 2019

1. Add scale-in cooldown support …

   This reimplements ASG scale-in cooldown inside the lambda. It takes two
   parameters which correspond to the existing ASG parameters in the
   elastic CI stack.
   
   1. `SCALE_IN_COOLDOWN_PERIOD` is the cooldown time between scale in
      events. This defaults to the existing 5 minutes.
   
   2. `SCALE_IN_ADJUSTMENT` is the maximum adjustment during scale-in
      events. Unlike the ASG we may scale in less if we calculate that the
      desired is closer than the adjustment. This defaults to the existing
      -1.
   
   This cheats a bit by storing `lastScaleInTime` in a global variable.
   This means we'll forget about our cooldown during a cold start. This
   should happen fairly infrequently and just make us a bit aggressive
   about scaling it; it shouldn't affect correctness.

   

   etaoins committed Mar 3, 2019
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