how we can add the following "<cluster-connection ...." entry using SED command after the "<jgroups-discovery-group..." if the entry "<cluster-connection ...." not present.
<jgroups-discovery-group name="dg-group1" jgroups-cluster="activemq-cluster"/>
<cluster-connection name="my-cluster" address="jms" connector-name="http-connector" discovery-group="dg-group1"/>
<jms-queue name="ExpiryQueue" entries="java:/jms/queue/ExpiryQueue"/>