Reorganize ETSI-CTI TITAN docker

#check and build stfubuntu image

DOCKER_ID=`docker ps -a | grep -e stfubuntu | awk '{ print $1 }'`

if [ ! -z "${DOCKER_ID}" ]

then

    docker rm --force ${DOCKER_ID}

fi

if [ -z `docker images -q stfubuntu` ]; then

  docker build --tag stfubuntu:18.04 -f Dockerfile.stfubuntu --force-rm  . || exit 1

fi