Add rsync to Ansible image

docker/Dockerfile

@@ -11,7 +11,7 @@ RUN echo "===> Adding Ansible's prerequisites..." && \
         apt-get install -y -q \
                 build-essential software-properties-common \
                 python python-tk python-pmw python-setuptools python-pip python-dev \
-                python3-setuptools python3-passlib python3-dev python3-pip python3-pycurl \
+                python3-setuptools python3-passlib python3-dev python3-pip python3-pycurl rsync \
                 libtool libssl-dev librsync-dev libffi-dev libcurl4-openssl-dev libxml2-dev libxslt1-dev zlib1g-dev \
                 at git nmap && \
     pip3 install --upgrade pip && \