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* s3api: do not store aws-chunked in an object's Content-Encoding aws-chunked in Content-Encoding names the SigV4 streaming framing of the request body, which the gateway decodes on upload. PutObject and CreateMultipartUpload stored the header as sent, so an object uploaded with "gzip, aws-chunked" was served with that Content-Encoding, and one uploaded with "aws-chunked" alone was served as aws-chunked. S3 drops aws-chunked and keeps the other encodings. Also run ceph/s3-tests' test_object_content_encoding_aws_chunked in CI. * s3api: read every Content-Encoding field, and drop aws-chunked on copy A client can send aws-chunked and the object's own encoding as separate Content-Encoding fields. Only the first was read, so "aws-chunked" followed by "gzip" left the object without its gzip. Combine all the fields before dropping aws-chunked. CopyObject with the REPLACE directive stored the requested Content-Encoding as sent: drop aws-chunked there too.