[stretch-backports] git fetch fails to fetch new tags from upstream remote

[Nicholas D Steeves <nsteeves@gmail.com>]

Stretch + git (and associated deps) from stretch-backports fails to
fetch new tags from upstream remote.

In the last month or so I've encountered this in three projects.  Here
is the fastest way to reproduce:

# from a stretch + git (and associated deps) from stretch-backports
git clone https://github.com/technomancy/find-file-in-project.git
cd find-file-in-project
git reset --hard 5.6.8
git pull
# refs are pulled, tags are not
git reset --hard 5.6.8
git fetch
# nothing is fetched

I've also tried using git gc --aggressive to see if it made any
difference.  It didn't :-(

Hopefully the cause can be discovered soon.  It's a major impediment
to a git-based packaging workflow.

Kind regards,
Nicholas

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