Standard authorization for backbeat routes

[williamlardier]

Better review commit per commit

The goal here is to handle the authorization from the IAM module in the backbeat routes, and not rely on implicit deny === access denied, as this is not true anymore. By doing so, we centralize the logic with all S3 APIs, and introduce some unit test to complete the functional tests from tests/multipleBackend/routes/routeBackbeat.js

Current state: functional tests for the ceph test suite and the ones using a real azure/aws/gcp are still not running because they were disabled long time ago, and the resources are not existing anymore, some are still there, but it will be done in a separate ticket.

[bert-e]

Hello williamlardier,

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[bert-e]

Incorrect fix version

The Fix Version/s in issue CLDSRV-591 contains:

• None

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

• 8.8.40

Please check the Fix Version/s of CLDSRV-591, or the target branch of this pull request.

[bert-e]

Waiting for approval

The following approvals are needed before I can proceed with the merge:

• the author

• 2 peers

[bert-e]

Incorrect fix version

The Fix Version/s in issue CLDSRV-591 contains:

• 8.8.40

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

• 8.8.40

• 8.9.0

Please check the Fix Version/s of CLDSRV-591, or the target branch of this pull request.

[bert-e]

Incorrect fix version

The Fix Version/s in issue CLDSRV-591 contains:

• 8.8.40

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

• 8.8.40

• 9.0.0

Please check the Fix Version/s of CLDSRV-591, or the target branch of this pull request.

[bert-e]

Incorrect fix version

The Fix Version/s in issue CLDSRV-591 contains:

• 8.8.41

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

• 8.8.41

• 9.0.0

Please check the Fix Version/s of CLDSRV-591, or the target branch of this pull request.