turing: Enable fail2ban, use unprivileged guix-daemon, clean up imports

[jchristgit]

                                  .-"``"-.
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| Q. Why is this so clumsy?                                           |
| A. The trick is to use Perl's strengths rather than its weaknesses. |
|                 -- Larry Wall in <8225@jpl-devvax.JPL.NASA.GOV>     |
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                               |_  |  _|  jgs
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                                /-'Y'-\
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                               ```