Adding "virtualbox" to KEY_SKIP_NETWORK_INTERFACES.
Adding 'virtualbox' to KEY_SKIP_NETWORK_INTERFACES
Retrieve InetAddress instead of InterfaceAddress when examining the
server's network interfaces: networkInterface.getInterfaceAddresses()
returns 'null' on some adapters if the parameter
'java.net.preferIPv4Stack=true' is passed to the JVM