bug#27169: eshell/sudo doesn't work with protected directories

[Yegor Timoshenko]

> Don't you also need (push 'eshell-tramp eshell-modules-list)?

I never did that and it seemed to work fine (I had to manually alias
sudo to eshell/sudo, though). Hopefully this will fix some other
problems with eshell I had recently, but adding 'eshell-tramp to
eshell-modules-list didn't resolve the issue.

> Does this work from M-x shell?

No, this one is specific to eshell (actually, to em-tramp eshell/sudo).

> Does C-x C-f /sudo::/tmp/a/ work?

It works.

> Does it make a difference if you run from the terminal vs running
> graphically (there's at least one macOS bug where this makes a
> difference, #21573).

It is reproducible both in graphical and terminal environments.