mv operation doesn't delete old file with digital ocean spaces

[fviard]

With DO spaces service, original file is not deleted of a successful move.
(And this is silent, no error reported)

[fviard]

Issue is coming from an xml parsing issue.
The xml response data given by DO for a COPY request is incorrect:
'<CopyObjectResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><LastModified>2017-11-05T00:36:02.161Z</LastModified><ETag>054fca7c5228bd350d60c06d8c319e4f-2</ETag></CopyObjectResult>',

The xml declaration is missing at the beginning. The reply should be like:
'<?xml version="1.0" encoding="UTF-8"?>\n<CopyObjectResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/"><LastModified>2017-11-05T00:27:49.000Z</LastModified><ETag>&quot;ba49a173c832e157a38ba966e0d7bcdb&quot;</ETag></CopyObjectResult>'

(To be noted, aws put a \n after the xml declaration, and DO don't do that for its other requests).

xml namespace stripping code in s3cmd has to be fixed to handle such a case.