Fix Bug#6019, Bug#9315.

Fix Bug#6019, Bug#9315.

* files.el (set-auto-mode): Call `file-name-sans-versions' for the
complete `buffer-file-name', the local file name part could look
remotely (for example on VMS).

* net/ange-ftp.el (ange-ftp-run-real-handler): Make it an alias of
`tramp-run-real-handler'.
(ange-ftp-fix-name-for-vms): Handle the case, where `name' is
already quoted by '"'.

* net/tramp.el (tramp-rfn-eshadow-update-overlay): Ignore errors.
Let `file-name-handler-alist' be nil, the local file name part
could look remotely (for example on VMS).