Dockefile_ubuntu_20.04: Create docker file

There are mismatches between versions of lcov/gcov/gcc on Ubuntu 18.04.  Thus,
using Ubuntu 20.04.

GitLab: #1187
Change-Id: I8809cd944f90c94092241368405eac4cd5c51e8f

docker/Dockerfile_ubuntu_20.04

+FROM ubuntu:20.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && \
+    apt install -y software-properties-common
+
+RUN add-apt-repository universe && \
+    apt-get update && \
+    apt-get install -y -o Acquire::Retries=10 \
+        g++ \
+        gcc \
+        cpp \
+        file \
+        make \
+        libc6-dev \
+        libstdc++-8-dev \
+        git \
+        autoconf \
+        automake \
+        autopoint \
+        cmake \
+        dpkg-dev \
+        libdbus-1-dev \
+        libdbus-c++-dev \
+        libupnp-dev \
+        libgnutls28-dev \
+        libargon2-dev \
+        libcanberra-gtk3-dev \
+        libclutter-gtk-1.0-dev \
+        libclutter-1.0-dev \
+        libglib2.0-dev \
+        libgtk-3-dev \
+        libnotify-dev \
+        qtbase5-dev \
+        qttools5-dev \
+        qttools5-dev-tools \
+        yasm \
+        nasm \
+        autotools-dev \
+        libtool \
+        gettext \
+        libpulse-dev \
+        libasound2-dev \
+        libpcre3-dev \
+        libyaml-cpp-dev \
+        libboost-dev \
+        libxext-dev \
+        libxfixes-dev \
+        libspeex-dev \
+        libspeexdsp-dev \
+        uuid-dev \
+        libavcodec-dev \
+        libavutil-dev \
+        libavformat-dev \
+        libswscale-dev \
+        libavdevice-dev \
+        libopus-dev \
+        libudev-dev \
+        libjsoncpp-dev \
+        libmsgpack-dev \
+        libnatpmp-dev \
+        libayatana-appindicator3-dev \
+        libqrencode-dev \
+        libnm-dev \
+        libwebkit2gtk-4.0-dev \
+        libcrypto++-dev \
+        libva-dev \
+        libvdpau-dev \
+        libssl-dev \
+        libsndfile1-dev \
+        libsecp256k1-dev \
+        libasio-dev \
+        libexpat1 libexpat1-dev \
+        lcov gcovr
+
+RUN ls -la /usr/include/c++/8/charconv
+
+# Tests framework
+RUN apt-get install -y -o Acquire::Retries=10 \
+        libcppunit-dev \
+        sip-tester
+
+RUN apt-get clean
+