Rename file with special character fails

[skuppa]

We can create a filename with + but we are not able to rename it since S3 backend fails with NoSuchKey.

Log

2020/11/05 22:51:13.141098 s3.ERROR CopyObject {
  Bucket: "my-bucket-name",
  CopySource: "my-bucket-name/samples/foo+",
  Key: "my-bucket-name/samples/.pureftpd-rename.20800.fa3dd36",
  MetadataDirective: "REPLACE",
  ServerSideEncryption: "AES256",
  StorageClass: "STANDARD"
} = NoSuchKey: The specified key does not exist.
	status code: 404, request id: 04313984FBD56708, host id: luBtJ4ycp9z2+B3hc6HfXyHGzdRcNrP1cFlj83iWlyiLBogY/UqkvYKR5NGxxT/k0PqbKxy5dKQ=

How to reproduce?
Try this on a goofys filesystem

touch foo+
mv foo+ foo
mv: cannot move 'foo+' to 'foo': No such file or directory
rm foo+
rm: remove regular empty file 'foo+'? y

Fixes by PR: #579

[skuppa]

Sorry, i closed it accidentally.