Always reread some files

[arthur.chereau]

> > I always want to reread those files.
>
> auto-revert-mode
>

Unfortunately this doesn't work because the *.log files buffers are opened 
immediately after their modification, that is:
- I compile
- a .log file is created
- I open the .log file
- I recompile
- the .log file is modified
- I open the .log file buffer (immediately, so auto-revert is too slow for that)
- Emacs asks me if it should reread the .log file
- auto-revert reverts the file, but it's too late

That's why I would like to disable the revert question for all *.log files.

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