choose-mirror: use git Mirrors.masterlist source.

Luis Guzmánrequested to merge
Ark74/package-helpers:upd_mirrors_d-i_choose-mirror_11 into aramo

This MR use the trisquel-packages!117 (merged) to provide the Mirrors.master and avoid use static sources which would easily outdate.

TODO: update python-apt accordingly.

Edited by Luis Guzmán

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