InstanceAlreadyExistsException: kafka.producer:type=app-info,id=brooklin-producer-1

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### Subject of the issue
When creating kafka mirroring tasks there's an exception regarding jmx. It seems to be a race condition b/c it doesn't always happen, and tends to happen more when `maxTasks` is higher.

```
[2019-11-27 14:35:37,129] WARN Error registering AppInfo mbean (org.apache.kafka.common.utils.AppInfoParser)
javax.management.InstanceAlreadyExistsException: kafka.producer:type=app-info,id=brooklin-producer-1
at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
at org.apache.kafka.common.utils.AppInfoParser.registerAppInfo(AppInfoParser.java:62)
at org.apache.kafka.clients.producer.KafkaProducer.(KafkaProducer.java:451)
at org.apache.kafka.clients.producer.KafkaProducer.(KafkaProducer.java:304)
at com.linkedin.datastream.kafka.factory.SimpleKafkaProducerFactory.createProducer(SimpleKafkaProducerFactory.java:27)
at com.linkedin.datastream.kafka.KafkaProducerWrapper.initializeProducer(KafkaProducerWrapper.java:176)
at com.linkedin.datastream.kafka.KafkaProducerWrapper.maybeGetKafkaProducer(KafkaProducerWrapper.java:147)
at com.linkedin.datastream.kafka.KafkaProducerWrapper.send(KafkaProducerWrapper.java:194)
at com.linkedin.datastream.kafka.KafkaTransportProvider.send(KafkaTransportProvider.java:151)
at com.linkedin.datastream.server.EventProducer.send(EventProducer.java:191)
at com.linkedin.datastream.connectors.kafka.AbstractKafkaBasedConnectorTask.sendDatastreamProducerRecord(AbstractKafkaBasedConnectorTask.java:274)
at com.linkedin.datastream.connectors.kafka.mirrormaker.KafkaMirrorMakerConnectorTask.sendDatastreamProducerRecord(KafkaMirrorMakerConnectorTask.java:246)
at com.linkedin.datastream.connectors.kafka.AbstractKafkaBasedConnectorTask.translateAndSendBatch(AbstractKafkaBasedConnectorTask.java:229)
at com.linkedin.datastream.connectors.kafka.AbstractKafkaBasedConnectorTask.processRecords(AbstractKafkaBasedConnectorTask.java:481)
at com.linkedin.datastream.connectors.kafka.AbstractKafkaBasedConnectorTask.run(AbstractKafkaBasedConnectorTask.java:315)
at java.lang.Thread.run(Thread.java:748)
```

### Your environment
I am using this docker image `dongjinleekr/brooklin:1.0.0-2`, which internally uses brooklin `1.0.0`

* Operating System: `4.9.0-11-amd64 #1 SMP Debian 4.9.189-3+deb9u1 (2019-09-20) x86_64 Linux`
* Brooklin version: `1.0.0`
* Java version: `openjdk version "1.8.0_212"`
* Kafka version: `2.1.0`
* ZooKeeper version: `3.4.10`

### Steps to reproduce
Start a mirror task with `maxTasks` 50 (other values could also work, my guess is that higher the value the bigger the chance)

For example:
```sh
bin/brooklin-rest-client.sh -o CREATE -u http://localhost:32311/ -n mirror -s "kafka://x.x.x.x.:9092/topic5" -c kafkaMirroringConnector -t kafkaTransportProvider -m '{"owner":"test-user","system.reuseExistingDestination":"false","maxTasks":"50"}' 2>/dev/null
```
### Expected behaviour
There should not be an error in the log and the mbean(s) should successfully register n

### Actual behaviour
There is an exception in the log and I'm guessing (but didn't check) that the mbean is not properly registered.

Start with SimpleKafkaProducerFactory.java:27 and the KafkaProducerWrapper initialization paths named in the stack trace. Reproduce with a mirror task using maxTasks 50, then inspect how concurrent producer creation reaches Kafka's AppInfoParser registration. Done means the race no longer produces the InstanceAlreadyExistsException and the relevant MBeans register successfully.

Written by the indexing model from the issue text.