gbp clone, upstream-branch is not 'upstream' but `release`

[Tong Sun <pkgoyq.xpt@neverbox.com>]

Hi, 

I did a 

gbp clone -v https://github.com/neurobin/shc.git

from scratch, but found that my branches are:

$ git branch -v

* master  556fd7a release after fix #38

  release 379c501 release after fix #38

See? the upstream-branch is not 'upstream' but called `release` instead. Why?

Shouldn't the upstream branch default to be 'upstream'?

    --upstream-branch=UPSTREAM_BRANCH

                        Upstream branch, default is 'upstream'

thx