Qubes component: builder-debian
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marmarek template: fix build with debootstrap 1.0.102
debootstrap >= 1.0.102 no longer setup dummy debootstrap.invalid source,
but put actual mirror in sources.list. Adjust
print-hashes-before-installing logic for this change.

Fixes QubesOS/qubes-issues#4387
Latest commit 2718304 Oct 16, 2018