Adds KAFKA_TAG env var and sets default as 2.11-1.0.2

Kafka image was being pulled from latest, which generated
incompatibilities with kafka clients used in modules.
It has been modified to pull from the latest supported version,
which is 1.0.2. In case there is a need to use another image tag,
it can be done through KAFKA_TAG env var.

Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>

installers/full_install_osm.sh

@@ -649,7 +649,7 @@ function generate_docker_images() {
     
     if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q KAFKA ; then
         sg docker -c "docker pull wurstmeister/zookeeper" || FATAL "cannot get zookeeper docker image"
-        sg docker -c "docker pull wurstmeister/kafka" || FATAL "cannot get kafka docker image"
+        sg docker -c "docker pull wurstmeister/kafka:${KAFKA_TAG}" || FATAL "cannot get kafka docker image"
     fi
 
     if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q MONGO ; then
@@ -806,7 +806,8 @@ function deploy_lightweight() {
     echo "export OSM_NETWORK=net${OSM_STACK_NAME}" | $WORKDIR_SUDO tee --append $OSM_DOCKER_WORK_DIR/osm_ports.sh
     echo "export TAG=${OSM_DOCKER_TAG}" | $WORKDIR_SUDO tee --append $OSM_DOCKER_WORK_DIR/osm_ports.sh
     echo "export DOCKER_USER=${DOCKER_USER}" | $WORKDIR_SUDO tee --append $OSM_DOCKER_WORK_DIR/osm_ports.sh
-  
+    echo "export KAFKA_TAG=${KAFKA_TAG}" | $WORKDIR_SUDO tee --append $OSM_DOCKER_WORK_DIR/osm_ports.sh
+
 
 
     pushd $OSM_DOCKER_WORK_DIR
@@ -1064,6 +1065,7 @@ WORKDIR_SUDO=sudo
 OSM_WORK_DIR="/etc/osm"
 OSM_DOCKER_TAG=latest
 DOCKER_USER=osm
+KAFKA_TAG=2.11-1.0.2
 
 while getopts ":hy-:b:r:k:u:R:l:p:D:o:m:H:S:s:w:t:" o; do
     case "${o}" in