create-message.sh add failover automation support

[BradleyA]

create-message.sh
Change the design to support running create-message.sh on any system in a cluster, not just the system in the cluster that has a scroll phat. Systems fail! To support an SRE environment of automation and failover

[BradleyA]

Need to think about incidents with this code that can be created and solved

#       Create missing host files from list in SYSTEM file
for NODE in $(cat ${DATA_DIR}${CLUSTER}/SYSTEMS) ; do
        touch ${DATA_DIR}${CLUSTER}/${NODE}
done
#
NODE_LIST=`find ${DATA_DIR}${CLUSTER} -type f ! -name SYSTEMS ! -name MESSAGE -print`
#       Check if ${NODE_LIST} is zero length
if [ -z "${NODE_LIST}" ] ; then
        echo -e "${NORMAL}${0} ${LINENO} [${BOLD}ERROR${NORMAL}]:      No file(s) found\n" 1>&2
        echo -e "\tCheck to make sure user has permission to create directory and files."
        exit 1
fi

[BradleyA]

Need to:

1. scp MESSAGE file to all remote hosts in cluster
2. scp SYSTEMS file to all remote hosts in cluster

When a system fails which this script started on; it can restart on another system in the cluster and the MESSAGE and SYSTEMS file will be available. By copying the MESSAGE file to all systems in the cluster, any system which has a Scroll-pHAT can display the MESSAGE information. The information in MESSAGE file is sent to remote systems before it has been updated, incident #3. This means remote systems with Scroll-pHAT will display the previous MESSAGE information. Thus systems with Scroll-pHAT will display the previous MESSAGE information.

Later this script will be moved into a docker container which will handle the failover restart process ..., incident #4.