Commits on Dec 3, 2019

1. scheduler: fix job update placement on prev node penalized …

   Fixes #5856
   
   When the scheduler looks for a placement for an allocation that's
   replacing another allocation, it's supposed to penalize the previous
   node if the allocation had been rescheduled or failed. But we're
   currently always penalizing the node, which leads to unnecessary
   migrations on job update.
   
   This commit leaves in place the existing behavior where if the
   previous alloc was itself rescheduled, its previous nodes are also
   penalized. This is conservative but the right behavior especially on
   larger clusters where a group of hosts might be having correlated
   trouble (like an AZ failure).
   
   Co-Authored-By: Michael Schurter <mschurter@hashicorp.com>

   

   tgross and schmichael committed Dec 3, 2019
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