Fix duplicate port forwarding on edge gateway

As mentioned earlier, I have modified the edge gateway port forwarding rules to use single port forwardings instead of 'any' to allow more than one vApp created by vagrant-vcloud running in an vCloud organization.
I'm currently running three vApps, two with my precise32 multibox sample from two different hosts.

The latter host is indeed a VM inside my vCloud where I have tested the vagrant-vcloud plugin without the edge_gateway settings as from inside my org I do not need the edge gateway port forwardings. They aren't working from inside and the vagrant ssh would time out. But simply removing the values from the global Vagrantfile for working inside the vOrg works pretty fine.

I now have two VMs 'web-vm' both with same IP address172.16.32.114 and two VMs 'db-vm' with same IP address 172.16.32.115, but they reside in two different vApps 'multiboxes-precise32-stefan.scherer-roenb014-xxxx' and 'multiboxes-precise32-vagrant-basebox-slave-xxxx' look pretty good.

So, I start the PR and we can discuss further improvements.