Buffer names don't get uniquified correctly when opening the same file
on multiple hosts with Tramp.  

For example, after opening files "/host-a:/tmp/foo" and
"/host-b:/tmp/foo", you get buffers named "foo" and "foo<2>".  I would
expect the buffer names to be something like "host-a:/foo" and
"host-b:/foo" (depending on the value of uniquify-buffer-name-style).

I see this with GNU Emacs 22.2.1.  It used to work as expected with
version 21.
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