RabbitMQ source connector can't connect

**Describe the bug**
Hello, I am trying to connect Pulsar with RabbitMQ. For that, I am trying to set up a source connector
**To Reproduce**
Steps to reproduce the behavior:
1. First of all I set up Pulsar with docker,
`docker run -it --name my-pulsar -p 6650:6650 -p 8080:8080 --mount source=pulsardata,target=/pulsar/data --mount source=pulsarconf,target=/pulsar/conf apachepulsar/pulsar-all:latest bin/pulsar standalone
`
2. Then I have created the YAML file for the connector,
configs:
host: ""
port: 5672
virtualHost: "/"
username: "myname"
password: "mypass"
queueName: "test1"
connectionName: "test1-connection"
requestedChannelMax: 0
requestedFrameMax: 0
connectionTimeout: 60000
handshakeTimeout: 10000
requestedHeartbeat: 60
prefetchCount: 0
prefetchGlobal: "false"
passive: "false"
With name rabbitmq.yaml, which I placed in folder examples.
3. Then I created the connector with pulsar-admin
`./bin/pulsar-admin sources create --tenant public --namespace default --name rabbit-connector --source-type rabbitmq --source-config-file examples/rabbitmq.yaml --destination-topic-name dst-topic`
4. Then the connector keep restarted forever.
5. In logs a get this,
` ERROR org.apache.pulsar.functions.instance.JavaInstanceRunnable - Source open produced uncaught exception:
java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method) ~[?:?]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:399) ~[?:?]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:242) ~[?:?]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:224) ~[?:?]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:?]
at java.net.Socket.connect(Socket.java:609) ~[?:?]
at com.rabbitmq.client.impl.SocketFrameHandlerFactory.create(SocketFrameHandlerFactory.java:60) ~[amqp-client-5.1.1.jar:5.1.1]
at com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory.newConnection(RecoveryAwareAMQConnectionFactory.java:62) ~[amqp-client-5.1.1.jar:5.1.1]
at com.rabbitmq.client.impl.recovery.AutorecoveringConnection.init(AutorecoveringConnection.java:99) ~[amqp-client-5.1.1.jar:5.1.1]
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:948) ~[amqp-client-5.1.1.jar:5.1.1]
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:907) ~[amqp-client-5.1.1.jar:5.1.1]
at com.rabbitmq.client.ConnectionFactory.newConnection(ConnectionFactory.java:1034) ~[amqp-client-5.1.1.jar:5.1.1]
at org.apache.pulsar.io.rabbitmq.RabbitMQSource.open(RabbitMQSource.java:65) ~[qCOnir1sptZl9djvqq9k1g/:?]
at org.apache.pulsar.functions.instance.JavaInstanceRunnable.setupInput(JavaInstanceRunnable.java:735) [org.apache.pulsar-pulsar-functions-instance-2.8.1.jar:2.8.1]
at org.apache.pulsar.functions.instance.JavaInstanceRunnable.setup(JavaInstanceRunnable.java:219) [org.apache.pulsar-pulsar-functions-instance-2.8.1.jar:2.8.1]
at org.apache.pulsar.functions.instance.JavaInstanceRunnable.run(JavaInstanceRunnable.java:243) [org.apache.pulsar-pulsar-functions-instance-2.8.1.jar:2.8.1]
at java.lang.Thread.run(Thread.java:829) [?:?]
`

The RabbitMQ is tested and runs smoothly with the given credentials.
Any idea what happened here?

Start with the RabbitMQSource.open call at line 65 and the connection-refused stack trace, then compare the connector's host setting with the Docker setup and RabbitMQ network address. Reproduce the pulsar-admin command and verify that the connector can reach RabbitMQ and remains running instead of restarting.

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