Commits on Aug 25, 2022

1. client: refactor cpuset manager initialization …

   This PR refactors the code path in Client startup for setting up the cpuset
   cgroup manager (non-linux systems not affected).
   
   Before, there was a logic bug where we would try to read the cpuset.cpus.effective
   cgroup interface file before ensuring nomad's parent cgroup existed. Therefor that
   file would not exist, and the list of useable cpus would be empty. Tasks started
   thereafter would not have a value set for their cpuset.cpus.
   
   The refactoring fixes some less than ideal coding style. Instead we now bootstrap
   each cpuset manager type (v1/v2) within its own constructor. If something goes
   awry during bootstrap (e.g. cgroups not enabled), the constructor returns the
   noop implementation and logs a warning.
   
   Fixes #14229

   

   shoenig committed Aug 25, 2022
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