Standarize UEFI menu entries

Daniel Juarez Gonzalezrequested to merge
uefi_http into master

I tested the changed entries so we do not face unexpected SNOW tickets. Unfortunately I found that I tested it on old HW that could not boot certain images.

Retrying on newer HW proved that this changes are working fine.

As a summary, we use linuefi (http) whenever we can. Same approach as on aims2sync after fixing grub.cfg building.

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