Add speedtest cli to Telegraf config

- Install speedtest CLI on cluster leader
- Install speedtest telegraf config on leader
- cleanup hosts in ping list
- Add custom shell script on leader to output speedtest data to influxdb
- improve version checking of Telegraf binary
- bump telegraf version
- allow ' package-latest' to pass ansible-lint

templates/scripts/telegraf_custom_metrics.sh.j2

@@ -17,4 +17,4 @@ if _uname=$(command -v uname); then
 fi
 
 # Print output
-printf "exec ip_external=%s,cpu_temp=%s" "\"${EXTERNAL_IP}\"" "${TEMP}"
+printf 'exec ip_external="%s",cpu_temp=%s' "${EXTERNAL_IP}" "${TEMP}"