The default auto-save-file-name-transforms does not work.

[Nikolay Kudryavtsev]

The default value for auto-save-file-name-transforms is supposed to move 
auto-save files for tramp buffers to the local machine's temp folder. 
This does not seem to work anymore.

As far as I was able to tell, the regexp is valid. One more thing, I 
noticed is that tramp files get "_a" as their directory delimiter during 
autosaving, as opposed to "|", like normal files, it may be connected.

I've tested 24.4 and 24.5 on both windows and linux.

To repeat - emacs -Q, open some text file over tramp, edit it a little 
bit so the autosave would appear. And it appears in the same folder as 
the file is located.

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Best Regards,
Nikolay Kudryavtsev