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 (0.99.1-1) unstable; urgency=medium

  * New upstream release
    - Update symbols file for new ABI
    - Bump ostree dependencies to 2018.6
    - flatpak Suggests avahi-daemon for peer-to-peer app sharing
    - Install new flatpak-coredumpctl script as an example

[dgit import unpatched flatpak 0.99.1-1]

Import flatpak_0.99.1.orig.tar.xz

[dgit import orig flatpak_0.99.1.orig.tar.xz]

Import flatpak_0.99.1-1.debian.tar.xz

[dgit import tarball flatpak 0.99.1-1 flatpak_0.99.1-1.debian.tar.xz]