Merge branch 'L2SS-225-rebuild_system_from_scratch.sh_does_not_work_on_test-lcu2' into 'master'

L2SS-225:  Fix rebuild_system_from_scratch.sh to also function on CentOS7

Closes L2SS-225

See merge request !41

bootstrap/sbin/rebuild_system_from_scratch.sh

-#! /usr/bin/env bash -e
+#! /usr/bin/env bash
 
 HOME_DIR=${LOFAR20_DIR:-${PWD}}
 if [ ! -d ${HOME_DIR}/bootstrap ]; then
@@ -7,6 +7,25 @@ if [ ! -d ${HOME_DIR}/bootstrap ]; then
     exit 1
 fi
 
+# Check if Docker compose can be found.
+DOCKER_COMPOSE="docker compose version"
+${DOCKER_COMPOSE} >&/dev/null
+ret=${?}
+if [ ${ret} -ne 0 ]; then
+    DOCKER_COMPOSE="docker-compose version"
+    ${DOCKER_COMPOSE} >&/dev/null
+    ret=${?}
+fi
+if [ ${ret} -eq 0 ]; then
+    echo -e "\tFound Docker Compose:  ${DOCKER_COMPOSE}"
+else
+    echo -e "\tThis system appears to not have Docker compose installed.  This means that the system cannot be rebuilt with this script."
+    return 1
+fi
+
+# Any error should terminate this script.
+set -e
+
 # Save for the moment when tango will be cloned.
 OLD_HOME_DIR=${HOME_DIR}.old
 
@@ -30,7 +49,13 @@ function move_tango_dir_out_of_the_way()
 
 function remove_images()
 {
-    ${HOME_DIR}/bootstrap/sbin/delete_all_docker_images.sh YES_DELETE_ALL
+    images="$(for i in $(docker images -q); do printf "%s " ${i}; done)"
+    if [ ${#images} -eq 0 ]; then
+        echo -e "\tThere are no images to delete."
+    else
+        echo -e "\tWill now delete the Docker images:"
+        docker rmi -f ${images}
+    fi
 }
 
 function pull_tango()