BB-640 Add VersioningEnabled header to Backbeat client

[nicolas2bert]

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[bert-e]

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[bert-e]

Incorrect fix version

The Fix Version/s in issue BB-640 contains:

• None

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

• 7.10.19

• 7.70.16

• 8.6.55

• 9.0.0

Please check the Fix Version/s of BB-640, or the target
branch of this pull request.

[francoisferrand]

LGTM (see scality/cloudserver#5707 (comment) about naming though).

Zenko's MultipleBackendTask extends ReplicateObject however, so we must double-check (in waterflow branches) that this extra check is not unexpectedly added to zenko's multi-backend replication.