ci: Use Ubuntu Bionic for websocket-autobahn job

Autobahn testsuite is based on Python 2.
See https://github.com/crossbario/autobahn-testsuite/issues/109.

Temporarily use an Ubuntu LTS distro still having Python 2, this will
make the job work for some years.

Hoping in the future to either:
- update Autobahn testsuite to Python 3;
- finding another testsuite for websockets.

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>

.gitlab-ci.yml

@@ -164,12 +164,24 @@ makecheck-windows:
   - mingw64-make LOG_COMPILE=wine -C server check || (cat server/tests/test-suite.log && exit 1)
 
 websocket-autobahn:
+  before_script:
+    - apt-get update -y
+    - >
+      apt-get install -y
+      debhelper
+      gstreamer1.0-libav gstreamer1.0-plugins-base gstreamer1.0-plugins-good
+      gstreamer1.0-plugins-ugly gstreamer1.0-tools
+      libgstreamer-plugins-base1.0-dev libgstreamer1.0-dev
+      libcacard-dev libglib2.0-dev
+      libjpeg-dev liblz4-dev libopus-dev libpixman-1-dev libsasl2-dev
+      libssl-dev pkg-config
+      python3-six python3-pyparsing liborc-0.4-dev git
+      g++ autoconf-archive python-pip
+      python3 python3-pip python3-setuptools python3-wheel ninja-build
+    - pip3 install meson
+    - *protocol
+  image: ubuntu:bionic
   script:
-  - >
-    dnf install python27 python-unversioned-command curl
-    -y
-  - curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
-  - python2 get-pip.py
   - pip2 install autobahntestsuite
   - wstest -a
   - git clean -fdx