Add a user to nagios to define a region

This will add another user to the nagios start up script
to allow a region to be defined based on a region
environment variable.

Change-Id: Ic067ef5052a684b918851a3b8fb1e4956225364c

nagios/scripts/entrypoint.sh

@@ -38,6 +38,9 @@ fi
 if [ -n "$CEPH_MGR_SERVICE" ]; then
   echo "\$USER10\$=${CEPH_MGR_SERVICE}" >> ${NAGIOS_HOME}/etc/resource.cfg
 fi
+if [ -n "$REGION" ]; then
+  echo "\$USER11\$=${REGION}" >> ${NAGIOS_HOME}/etc/resource.cfg
+fi
 
 touch ${NAGIOS_HOME}/etc/objects/prometheus_discovery_objects.cfg
 chown nagios ${NAGIOS_HOME}/etc/objects/prometheus_discovery_objects.cfg