Open the test file once outside of the tests for loop. This helps avoid
object consistency problems when running against S3 providers without
strong consistency (like Amazon). See Issue #263.
This also encodes asterisk and tilde correctly when listing a file
with a V4 auth endpoint. Also add tests for special characters
although s3proxy does not yet support V4 auth.
Fixes#188. Fixes#194.
nautilus does this when you drag and drop to overwrite a file:
1) create .goutputstream-XXXXXX to write to
2) fsync the fd for .goutputstream-XXXXXX
3) rename .goutputstream-XXXXXX to target file
4) close the fd for .goutputstream-XXXXXX
previously, doing this on s3fs would result in an empty target file
because after the rename, s3fs would not flush the content of
.goutputstream-XXXXXX to target file.
this change moves the FdEntity from the old path to the new path
whenever rename happens. On flush s3fs would now flush the correct
content to the rename target.
