Add test_bionic

.buildbot/bionic/Dockerfile

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+FROM ubuntu:bionic AS test_bionic
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update -y && apt-get install -yq --no-install-suggests --no-install-recommends \
+    buildbot-slave git subversion python3-dev libffi-dev python3-setuptools \
+    python3-pip dumb-init curl openssh-client wget \
+    python-qt4 python-pyqt5 \
+    build-essential libcap-dev libmtdev-dev xvfb tor xclip python3-opencv
+
+RUN pip3 install coverage psutil pycrypto \
+    xvfbwrapper python_prctl six

.buildbot/bionic/build.sh

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+#!/bin/sh
+python setup.py install --user
+export PYTHONWARNINGS=all

.buildbot/bionic/test.sh

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+#!/bin/bash
+python checkdeps.py
+python src/bitmessagemain.py -t
+python -bm tests