Fix Azure Download Dir Issues
Why call issues ? Well because Azure thinks that the "fs layer" they provide on their BLOB service can be somewhat like a FS...but not actually an FS, so when the behavior is stupid..NO PROBLEM =D. Of course that the behavior is stupid and useless...but on some conceptual level it makes sense for them. So we just make it work inside klb with a layer of behavior adjustements.
Resuming, azure_blob_fs_download_dir now works as expected.