travis: improve build process and expand build matrix

Make a build heriarchy to reduce images size.
Add Android Things builds to build matrix.
Drop gcc-4 builds, use gcc-5 and gcc-6 instead.
Add SonarQube static analysis scans.

Signed-off-by: Nicolas Oliver <dario.n.oliver@intel.com>

docker/Dockerfile.base

@@ -0,0 +1,68 @@
+FROM ubuntu:16.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Prepare apt-get
+RUN apt-get update && apt-get -y --no-install-recommends install software-properties-common
+
+# Add Mraa Repository
+RUN add-apt-repository ppa:mraa/mraa && \
+  # Update apt-get
+  apt-get -y update && \
+  # Install apt-utils
+  apt-get -y --no-install-recommends install apt-utils && \
+  # Main Build Dependencies
+  apt-get -y --no-install-recommends install git build-essential cmake swig clang-3.8 gcc-5 g++-5 libpthread-stubs0-dev pkg-config wget unzip \
+  # Mraa Build Dependencies
+  libmraa1 libmraa-dev mraa-tools \
+  # Docs Build Dependencies
+  python-sphinx doxygen graphviz \
+  # Sensor Specific Build Dependencies
+  libjpeg-dev
+
+# Test Build Dependencies
+RUN apt-get -y --no-install-recommends install python python-dev python-pip && \
+    pip install chardet
+
+# Install gcc-6 g++-6
+RUN add-apt-repository ppa:ubuntu-toolchain-r/test && \
+    apt-get update && \
+    apt-get -y --no-install-recommends install gcc-6 g++-6
+
+WORKDIR /opt
+
+# Install libbacnet 0.3.12
+RUN wget https://downloads.sourceforge.net/project/bacnet/bacnet-stack/bacnet-stack-0.8.3/bacnet-stack-0.8.3.zip && \
+    unzip -qq bacnet-stack-0.8.3.zip && cd bacnet-stack-0.8.3 && \
+    BACDL_DEFINE=-DBACDL_MSTP=1 MAKE_DEFINE=-fPIC make clean all && \
+    cp /opt/bacnet-stack-0.8.3/lib/libbacnet.a /usr/lib/libbacnet.a && \
+    echo "prefix=/usr" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "exec_prefix=\${prefix}" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "libdir=\${exec_prefix}/lib" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "includedir=\${exec_prefix}/include" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "Name: bacnet" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "Description: BACnet library" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "Version: 0.8.3" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "Libs: -L\${libdir} -lbacnet" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    echo "Cflags: -I\${includedir}/bacnet" >> /usr/lib/pkgconfig/libbacnet.pc && \
+    mkdir /usr/include/bacnet && \
+    cp /opt/bacnet-stack-0.8.3/include/* /usr/include/bacnet/ && \
+    rm -fr /opt/bacnet-stack-0.8.3.zip
+
+# Install libmodbus 3.1.4
+RUN wget http://libmodbus.org/releases/libmodbus-3.1.4.tar.gz && \
+    tar xf libmodbus-3.1.4.tar.gz && cd libmodbus-3.1.4 && \
+    ./configure && make -j8 && make install && \
+    rm -fr /opt/libmodbus-3.1.4.tar.gz
+
+# Install openzwave
+RUN apt-get update && apt-get -y --no-install-recommends install libudev-dev && \
+    git clone --depth 1 https://github.com/OpenZWave/open-zwave.git && cd open-zwave && make -j8 install && \
+    echo "/usr/local/lib64" >> /etc/ld.so.conf.d/openzwave.conf
+
+# Set Workdir
+ARG UPM_SRC_DIR=/usr/src/app
+ENV UPM_SRC_DIR $UPM_SRC_DIR
+WORKDIR $UPM_SRC_DIR
+
+CMD bash