JTE - Jigdo Template Export - Faster Jigdo template generation

[John Reiser]

> If you could release the templates ASAP, that would help the mirrors 
> who already have the files locally in their rawhide trees.

If pungi were working today[1], then many tree-holders could build
by themselves the .iso images [for the $ARCH on which the files reside.]

[1] https://bugzilla.redhat.com/show_bug.cgi?id=443074

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