travis: improve docker images generation for building

Make a build heriarchy to reduce images size.
Add Android Thing Build.

Signed-off-by: Nicolas Oliver <dario.n.oliver@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

docker/Dockerfile.android

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+FROM mraa-java
+
+WORKDIR /opt
+
+# Install CMake 3.6.2
+RUN wget -q https://cmake.org/files/v3.6/cmake-3.6.2-Linux-x86_64.sh && \
+    mkdir /opt/cmake && \
+    sh /opt/cmake-3.6.2-Linux-x86_64.sh --prefix=/opt/cmake --skip-license && \
+    ln -s /opt/cmake/bin/cmake /usr/local/bin/cmake && \
+    cmake --version && \
+    rm -fr /opt/cmake-3.6.2-Linux-x86_64.sh
+
+# Android NDK build Dependencies
+RUN wget -q https://dl.google.com/android/repository/android-ndk-r14b-linux-x86_64.zip && \
+    unzip -qq android-ndk-r14b-linux-x86_64.zip && \
+    rm -fr android-ndk-r14b-linux-x86_64.zip
+ENV NDK_HOME /opt/android-ndk-r14b
+ENV NDK_MODULE_PATH /opt/android-ndk-r14b
+
+# Android Things library
+RUN wget -q https://github.com/androidthings/native-libandroidthings/archive/0.4.1-devpreview.tar.gz && \
+    tar xf 0.4.1-devpreview.tar.gz && \
+    rm -fr /opt/0.4.1-devpreview.tar.gz
+ENV ANDROIDTHINGS_NATIVE_LIB /opt/native-libandroidthings-0.4.1-devpreview
+
+# Set Workdir
+WORKDIR $MRAA_SRC_DIR
+
+CMD bash

docker/Dockerfile.base

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+FROM ubuntu:16.04
+
+ENV DEBIAN_FRONTEND noninteractive
+
+# Update apt-get
+RUN 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 clang-3.8 \
+  g++-4.8 wget ca-certificates libpcre3 libpcre3-dev python unzip \
+  # Docs Build Dependencies
+  python-sphinx doxygen graphviz \
+  # Json Platform Build Dependencies
+  pkg-config libjson0 libjson0-dev \
+  # Imraa Platform Build Dependencies
+  libudev-dev \
+  # Doc Build Dependencies
+  python-sphinx doxygen graphviz
+
+# Set library download folder to /opt
+WORKDIR /opt
+
+# Swig Build Dependencies
+ARG SWIG_VERSION=3.0.10
+RUN wget -q http://iotdk.intel.com/misc/tr/swig-$SWIG_VERSION.tar.gz && \
+    tar xf swig-$SWIG_VERSION.tar.gz && cd swig-$SWIG_VERSION && \
+    ./configure --prefix=/usr/ && make -j8 && make -j8 install && cd .. && \
+    rm -fr /opt/swig-$SWIG_VERSION.tar.gz
+
+# FTDI4222 Build Dependencies
+ARG FTDI4222_VERSION=linux-1.3.1.117
+RUN mkdir libft4222-$FTDI4222_VERSION && cd libft4222-$FTDI4222_VERSION && \
+    wget -q http://www.ftdichip.com/Support/SoftwareExamples/libft4222-$FTDI4222_VERSION.tgz && \
+    tar xf libft4222-$FTDI4222_VERSION.tgz && ./install4222.sh && \
+    rm -fr libft4222-$FTDI4222_VERSION.tgz
+
+# Set Workdir
+ARG MRAA_SRC_DIR=/usr/src/app
+ENV MRAA_SRC_DIR $MRAA_SRC_DIR
+WORKDIR $MRAA_SRC_DIR
+
+CMD bash

docker/Dockerfile.java

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+FROM mraa-base
+
+# Update apt-get
+RUN apt-get -y update && \
+  # Java Build Dependencies
+  apt-get -y --no-install-recommends install default-jre default-jdk
+
+# Set JAVA_HOME
+ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/
+
+# Set Workdir
+WORKDIR $MRAA_SRC_DIR
+
+CMD bash

docker/Dockerfile.node

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+FROM mraa-base
+
+WORKDIR /opt
+
+# Node.js Build Dependencies
+RUN wget -q -O - https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash
+ENV NVM_DIR /root/.nvm
+ARG NODE_VERSION
+RUN . $NVM_DIR/nvm.sh && nvm install $NODE_VERSION && nvm use $NODE_VERSION && \
+    npm install -g node-gyp && node-gyp install
+ENV PATH $NVM_DIR/versions/node/$NODE_VERSION/bin:$PATH
+
+# Set Workdir
+WORKDIR $MRAA_SRC_DIR
+
+CMD bash

docker/Dockerfile.python

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+FROM mraa-base
+
+# Update apt-get
+RUN apt-get -y update && \
+  # Python 2 Build Dependencies
+  apt-get -y --no-install-recommends install python python-dev \
+  # Python 3 Build Dependencies
+  python3 python3-dev
+
+# Set Workdir
+WORKDIR $MRAA_SRC_DIR
+
+CMD bash

docker/Dockerfile.sonar

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+FROM mraa-base
+
+# Update apt-get
+RUN apt-get -y update && \
+  # Python 2 Build Dependencies
+  apt-get -y --no-install-recommends install python python-dev \
+  # Python 3 Build Dependencies
+  python3 python3-dev \
+  # Java Build Dependencies
+  default-jre default-jdk
+
+# Set JAVA_HOME
+ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/
+
+WORKDIR /opt
+
+# Node.js Build Dependencies
+RUN wget -q -O - https://raw.githubusercontent.com/creationix/nvm/v0.33.2/install.sh | bash
+ENV NVM_DIR /root/.nvm
+ARG NODE_VERSION
+RUN . $NVM_DIR/nvm.sh && nvm install $NODE_VERSION && nvm use $NODE_VERSION && \
+    npm install -g node-gyp && node-gyp install
+ENV PATH $NVM_DIR/versions/node/$NODE_VERSION/bin:$PATH
+
+# Static Code Analysis Scanner
+ENV SONAR_DIR /opt/sonar
+ENV SONAR_VER "3.0.3.778"
+WORKDIR $SONAR_DIR
+RUN wget https://sonarsource.bintray.com/Distribution/sonar-scanner-cli/sonar-scanner-cli-${SONAR_VER}-linux.zip && \
+    wget https://sonarqube.com/static/cpp/build-wrapper-linux-x86.zip && \
+    unzip sonar-scanner-cli-${SONAR_VER}-linux.zip && \
+    unzip build-wrapper-linux-x86.zip && \
+    rm sonar-scanner-cli-${SONAR_VER}-linux.zip build-wrapper-linux-x86.zip
+ENV PATH $SONAR_DIR/sonar-scanner-${SONAR_VER}-linux/bin:$SONAR_DIR/build-wrapper-linux-x86:$PATH
+
+# Set Workdir
+WORKDIR $MRAA_SRC_DIR
+
+CMD bash