Remote disk space checks from Linux not working

[Anthirian]

We can't use SMB or NFS URLs with the os.statvfs() method provided by non-Windows file systems. XBMC however is still able to use these protocols for mounting shares via its internal file system. Unfortunately the xbmcvfs Python addon module has no statvfs() method that we can use. To resolve this, we need to either use the internal mounting file system used by XBMC to access shares using these protocols, or build a custom library for accessing SMB and NFS shares that does contain a statvfs() method.