LAM-52 Corrected server.properties file in apache-kafka role.

ansible/roles/apache-kafka/templates/server.properties.j2

@@ -117,7 +117,7 @@ log.cleaner.enable=false
 # server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
 # You can also append an optional chroot string to the urls to specify the
 # root directory for all kafka znodes.
-zookeeper.connect={{ hostvars[groups['master'] | replace("'","") | replace("[","") | replace(", ","\n") | replace("]","") | replace(".vm.okeanos.grnet.gr","")]['internal_ip'] }}:2181
+zookeeper.connect={{ hostvars[groups['master'][0]]['internal_ip'] }}:2181
 
 # Timeout in ms for connecting to zookeeper
 zookeeper.connection.timeout.ms=6000