Fuse ESB 7.1 Fabric: multiple zookeeper ensemble containers running on the same host creates a port conflict

Issue

• ensemble container logs the following exception

 ZKServerFactoryBean              | ternal.BaseManagedServiceFactory  151 | 50 - org.fusesource.fabric.fabric-zookeeper - 7.1.0.fuse-047 | Error creating service for ManagedServiceFactory ZooKeeper Server Factory
     java.net.BindException: Address already in use
    at sun.nio.ch.Net.bind0(Native Method)[:1.7.0_13]
    at sun.nio.ch.Net.bind(Unknown Source)[:1.7.0_13]
    at sun.nio.ch.Net.bind(Unknown Source)[:1.7.0_13]
    at sun.nio.ch.ServerSocketChannelImpl.bind(Unknown Source)[:1.7.0_13]
    at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source)[:1.7.0_13]
    at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source)[:1.7.0_13]
    at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:111)[49:org.fusesource.fabric.fabric-linkedin-zookeeper:7.1.0.fuse-047]
    at org.fusesource.fabric.zookeeper.internal.ZKServerFactoryBean.doCreate(ZKServerFactoryBean.java:76)[50:org.fusesource.fabric.fabric-zookeeper:7.1.0.fuse-047]
    at org.fusesource.fabric.zookeeper.internal.BaseManagedServiceFactory.internalUpdate(BaseManagedServiceFactory.java:135)[50:org.fusesource.fabric.fabric-zookeeper:7.1.0.fuse-047]
    at org.fusesource.fabric.zookeeper.internal.BaseManagedServiceFactory.access$000(BaseManagedServiceFactory.java:36)[50:org.fusesource.fabric.fabric-zookeeper:7.1.0.fuse-047]
    at org.fusesource.fabric.zookeeper.internal.BaseManagedServiceFactory$1.run(BaseManagedServiceFactory.java:78)[50:org.fusesource.fabric.fabric-zookeeper:7.1.0.fuse-047]
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[:1.7.0_13]
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)[:1.7.0_13]
    at java.util.concurrent.FutureTask.run(Unknown Source)[:1.7.0_13]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)[:1.7.0_13]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)[:1.7.0_13]
    at java.lang.Thread.run(Unknown Source)[:1.7.0_13]