Use rohmu transfer pool to fix io error on closed fds on restore

[giacomo-alzetta-aiven]

About this change: What it does, why it matters

Currently myhoard can fail with: ValueError: I/O operation on closed file during restore (. The problem is likely due to non thread-safety of the rohmu transfers.

Using rohmu's transfer pool we should eliminate any possible case in which multiple threads operated on the same transfer object, or cases in which a "stale" transfer object was used by a single thread.

[giacomo-alzetta-aiven]

Seem like CI is broken? It failed to setup the linting...

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.72093% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 78.54%. Comparing base (c53a64f) to head (0ed5c6a).

Files	Patch %	Lines
myhoard/restore_coordinator.py	83.72%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
- Coverage   79.22%   78.54%   -0.69%     
==========================================
  Files          16       16              
  Lines        4506     4503       -3     
  Branches     1018     1021       +3     
==========================================
- Hits         3570     3537      -33     
- Misses        699      729      +30     
  Partials      237      237              

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