Add intuitive error message for the 'BindException: Address already in use' error in server startup

[chanikag]

Description:
I got following error as the msf4j-https port is already using in my machine.

ERROR {org.wso2.msf4j.internal.HttpConnectorPortBindingListener} - Error in http server connector java.net.BindException: Address already in use
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:130)
at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:563)
at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1332)
at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:488)
at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:473)
at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:984)
at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:259)
at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:366)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:495)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)

It is better to add the port number in the log to troubleshoot the issue easily.

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[lkokila]

For references, this can be sorted out by changing the following ports in the deployment.yaml file.

  listenerConfigurations:
    -
      id: "default"
      host: "0.0.0.0"
      port: 7070
    -
      id: "msf4j-https"
      host: "0.0.0.0"
      port: 7443

But it would be helpful if this is addressed either through port offsetting or with a descriptive log.