fix concurrent mpu completions

[SylvainSenechal]

Issue: CLDSRV-687

Related : scality/Arsenal#2459

[bert-e]

Hello sylvainsenechal,

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[bert-e]

Incorrect fix version

The Fix Version/s in issue CLDSRV-687 contains:

• None

Considering where you are trying to merge, I ignored possible hotfix versions and I expected to find:

• 9.1.0

Please check the Fix Version/s of CLDSRV-687, or the target
branch of this pull request.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.91%. Comparing base (615f831) to head (429693e).
Report is 25 commits behind head on development/9.1.

✅ All tests successful. No failed tests found.

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/services.js	83.38% <ø> (ø)

@@               Coverage Diff                @@
##           development/9.1    #5879   +/-   ##
================================================
  Coverage            75.91%   75.91%           
================================================
  Files                  188      188           
  Lines                11976    11976           
================================================
  Hits                  9091     9091           
  Misses                2885     2885           

Flag	Coverage Δ
ceph-backend-test	45.44% <ø> (ø)
file-ft-tests	47.33% <ø> (ø)
kmip-ft-tests	26.99% <ø> (ø)
mongo-v0-ft-tests	47.77% <ø> (ø)
mongo-v1-ft-tests	47.78% <ø> (ø)
multiple-backend	33.98% <ø> (ø)
sur-tests	35.47% <ø> (+0.83%)	⬆️
sur-tests-inflights	36.55% <ø> (ø)
unit	66.93% <ø> (ø)
utapi-v2-tests	33.34% <ø> (ø)

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