Use Python 3 for test web server

The parts of libtest.sh and tests/make-test-runtime.sh that deal with
Python 2 are unaffected: they are only used in the flatpak-builder
tests.

Forwarded: not-needed

Gbp-Pq: Topic debian
Gbp-Pq: Name Use-Python-3-for-test-web-server.patch

flatpak (0.10.2.1-2) unstable; urgency=medium

  * Move Vcs-* to salsa.debian.org
  * Standards-Version: 4.1.3 (no changes required)
  * d/control, d/tests/control,
    d/p/debian/Use-Python-3-for-test-web-server.patch:
    Use Python 3 for tests

[dgit import unpatched flatpak 0.10.2.1-2]

Import flatpak_0.10.2.1-2.debian.tar.xz

[dgit import tarball flatpak 0.10.2.1-2 flatpak_0.10.2.1-2.debian.tar.xz]

Import flatpak_0.10.2.1.orig.tar.xz

[dgit import orig flatpak_0.10.2.1.orig.tar.xz]