Display a single "substitute: updating list of substitutes from ..."

[Pierre Neidhardt]

Every now and then, guix updates the list of substitutes.  While doing
so, it displays a bunch of

        substitute: updating list of substitutes from 
'https://mirror.hydra.gnu.org'... 100.0%

Sometimes dozens of them in a row.  I don't find it very informative to
show this to the user more than once.  Is there a specific reason to
display it multiple times?

--
Pierre Neidhardt

Would a giant, profit-oriented cartel lie to you?
                -- Top Ten List, Late Night with David Letterman

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