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This reverts commit e28916c9 (in general).

  The optimization introduced by that change is no longer necessary following
  commit b8d962a9 ("grid/slapgrid.py: reduce
  number of installation.available calls"). Since API calls are now less
  frequent, avoiding the POST to the master offers little benefit.

  Worse, skipping the POST can now cause issues: if the software is
  reconstructed and its state transitions to "building", it may never
  be reported back as "available" in some race conditions, leading
  to incorrect or outdated local state.

/reviewed-on nexedi/slapos.core!791