BindException should be caught and sent to karaf.log instead of console

to reproduce this first install "odl-vpnservice-openstack" then install
"odl-netide-rest"

on the karaf console, you will see the below exception. This issue is
only to address the fact that we should not be seeing trouble on the
karaf console, but in the log. The port (6644) in conflict needs to be
addressed with vpnservice as well, but that is a separate issue:

Exception in thread "Thread-100" 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 sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:125)
at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:485)
at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1089)
at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:440)
at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:425)
at io.netty.channel.ChannelDuplexHandler.bind(ChannelDuplexHandler.java:38)
at io.netty.handler.logging.LoggingHandler.bind(LoggingHandler.java:197)
at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:440)
at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:425)
at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:903)
at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:198)
at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:348)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
at java.lang.Thread.run(Thread.java:745)