Add a script to fetch package sources from Fedora's Pagure
infrastructure site at https://src.fedoraproject.org/, based upon
github-fetch.py (I broke out the internal fetch function with the intent
to share it with that other script, however I didn't in the end as I
wanted the scripts to remain independent).
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
