webdav.py Default.stat() module: Match error when finding size of current file

[cfenell]

Motivation

The stat method tries to find the reported size of the current file in the list returned by the PROPFIND request in this way:

        parser.feed(result.text)
        for file_name in parser.sizes:
            if '%s%s' % (self.server, file_name) == path:
                dict_['size'] = parser.sizes[file_name]
        parser.close()
        return dict_

However, for me self_server ends with PREFIX and file_name starts with PREFIX, so the match will always fail unless one PREFIX is stripped. As an example this should match:
if "https://store1.eiscat3d.se:2880/home/tester/home/tester/root.EISCAT/dd/f0/file2.bin.rucio.upload"== "https://store1.eiscat3d.se:2880/home/tester/root.EISCAT/dd/f0/file2.bin.rucio.upload"

Modification

self.server should probably be only https://hostname:port without the /prefix/ part.