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examples/rgw/boto3/README.md: update documentation for boto3 extension installation. Fixes: https://tracker.ceph.com/issues/67768
examples: move rgw examples under subdirectory
RGW/logging: add filtering for bucket logging
examples/rgw: register boto extension for BucketIndex on CreateBucket
examples/rgw: register boto extension for HeadBucket stats
RGW/logging: add rest API to flush logging bucket
Add new sync-policy related params to boto3 extension
rgw/logging: rollover objects when conf changes