We want to only append string  
 
-javaagent:{{jmxexporter_jar_path}}={{zookeeper_jmxexporter_port}}:{{zookeeper_jmxexporter_config_path}}"'
to a file override.conf
if we have "Environment="KAFKA_JMX_OPTS" in it else 
add new line  "actual line"

Environment="KAFKA_OPTS=-javaagent:{{jmxexporter_jar_path}}={{zookeeper_jmxexporter_port}}:{{zookeeper_jmxexporter_config_path}}"'

So basically append if something is there else add new line.

I m struggling to get regex ryt.

Currently the override.conf file has this below content with jmx parameters 
in it so  we want append  above line/string to  end of the existing line 

Environment="KAFKA_JMX_OPTS=-javaagent:/usr/share/java/kafka/jolokia.jar=port=8778,host=pilot01.test
 
-Dcom.sun.management.jmxremote 
-Dcom.sun.management.jmxremote.authenticate=false 
-Dcom.sun.management.jmxremote.ssl=false 
-Djava.rmi.server.hostname=pilot01.test 
-Dcom.sun.management.jmxremote.rmi.port=1099"

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