Object lock object retention

[giubacc]

Object retention features implemented:

• Default Bucket'retention configuration for both GOVERNANCE/COMPLIANCE
  modes.
• Default bucket's retention mode on objects when no
  explicit retention is specified on put_object().
• Explicit retention mode set on object's versions with put_object().
• Tested expected behavior on objects for both GOVERNANCE/COMPLIANCE modes.
• Tested expected behavior for deletions with BypassGovernanceRetention flag set.

Fixes: https://github.com/aquarist-labs/s3gw/issues/327
Signed-off-by: Giuseppe Baccini giuseppe.baccini@suse.com

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[github-actions]

This pull request can no longer be automatically merged: a rebase is needed and changes have to be manually resolved

[irq0]

Commit message: Tested not verified? Verification means something way stronger (https://en.wikipedia.org/wiki/Software_verification)

Lines are a bit long
See: https://github.com/ceph/ceph/blob/main/CodingStyle
https://google.github.io/styleguide/cppguide.html
Consider running the python code through black

[giubacc]

Commit message: Tested not verified? Verification means something way stronger (https://en.wikipedia.org/wiki/Software_verification)

Lines are a bit long See: https://github.com/ceph/ceph/blob/main/CodingStyle https://google.github.io/styleguide/cppguide.html Consider running the python code through black

Rephrased with "Tested" and formatted py code with black