Commits on Oct 28, 2020

1. Properly release lock on all scale checks …

   Scale checks are done regularly, to validate that running instances
   number matches expected number of instances in runSpec.
   
   There are two cases:
   * There are missing instances, in that case marathon starts new
     instances
   * There are too many instances, in that case marathon kills overdue
     instances
   
   In second case, lock is supposed to be released only when overdue instances
   are dead. We encountered issues where lock was never released because
   KillStreamWatKillStreamWatcher.watchForKilledTasks() future was never
   ending. This is because of a typo in the code, making it wait for ALL
   instances to die, instead of just the overdue subset.

   

   Lqp1 committed Oct 28, 2020
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