ports/174976: fix for IPv6 port setting

[Stefan Bethke]

With the following patch, VirtualBox uses the vrde properties VNCAddress4, VNCAddress6, VNCPort4, and VNCPort6, and passes their values to libvncserver.  For example:
$ VBoxManage modifyvm Ubuntu --vrdeproperty VNCPort4=5902
$ VBoxManage modifyvm Ubuntu --vrdeproperty VNCPort6=5902

-- 
Stefan Bethke <stb at lassitu.de>   Fon +49 151 14070811
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