Commits on Aug 1, 2023

1. allocwatcher: don't destroy local allocdir after migration …

   When ephemeral disks are migrated from an allocation on the same node,
   allocation logs for the previous allocation are lost.
   
   There are two workflows for the best-effort attempt to migrate the allocation
   data between the old and new allocations. For previous allocations on other
   clients (the "remote" workflow), we create a local allocdir and download the
   data from the previous client into it. That data is then moved into the new
   allocdir and we delete the allocdir of the previous alloc.
   
   For "local" previous allocations we don't need to create an extra directory for
   the previous allocation and instead move the files directly from one to the
   other. But we still delete the old allocdir _entirely_, which includes all the
   logs!
   
   There doesn't seem to be any reason to destroy the local previous allocdir, as
   the usual client garbage collection should destroy it later on when needed. By
   not deleting it, the previous allocation's logs are still available for the user
   to read.
   
   Fixes: #18034

   

   tgross committed Aug 1, 2023
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