Commits on Aug 3, 2021

1. core: implement system batch scheduler …

   This PR implements a new "System Batch" scheduler type. Jobs can
   make use of this new scheduler by setting their type to 'sysbatch'.
   
   Like the name implies, sysbatch can be thought of as a hybrid between
   system and batch jobs - it is for running short lived jobs intended to
   run on every compatible node in the cluster.
   
   As with batch jobs, sysbatch jobs can also be periodic and/or parameterized
   dispatch jobs. A sysbatch job is considered complete when it has been run
   on all compatible nodes until reaching a terminal state (success or failed
   on retries).
   
   Feasibility and preemption are governed the same as with system jobs. In
   this PR, the update stanza is not yet supported. The update stanza is sill
   limited in functionality for the underlying system scheduler, and is
   not useful yet for sysbatch jobs. Further work in #4740 will improve
   support for the update stanza and deployments.
   
   Closes #2527

   

   shoenig authored and Mahmood Ali committed Aug 3, 2021
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2. e2e: fix tests …

   Use basic sleeps in busybox images. busybox are very light, and ping has
   permissions complications, and it may fail for network related
   issues.

   Mahmood Ali committed Aug 3, 2021
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