[Basic Networking] New Security Groups can be created from Vagrantfile

It's easier if the Security Group can be defined in the Vagrantfile.
For example like this:

```ruby
[...]
config.vm.provider :cloudstack do |cloudstack, override|
    cloudstack.host = "api.exoscale.ch"
    cloudstack.path = "/compute"
    cloudstack.port = "443"
    cloudstack.scheme = "https"
    cloudstack.keypair = "exoscale"
    
    cloudstack.api_key = "your_api_key"
    cloudstack.secret_key = "your_secret_key"
    

    cloudstack.template_id = "a17b40d6-83e4-4f2a-9ef0-dce6af575789" #Ubuntu 12.04
    cloudstack.service_offering_id = "71004023-bb72-4a97-b1e9-bc66dfce9470" # Micro instance with 10GB disk
    cloudstack.zone_id = "1128bd56-b4d9-4ac6-a7b9-c715b187ce11" #GV2
    cloudstack.network_type = "Basic"
    cloudstack.security_groups = [
      { 
        :name         => "common", 
        :description  => "created in the Vagrantfile", 
        :rules        => [
          {:type => "ingress", :protocol => "TCP", :startport => 22, :endport => 22, :cidrlist => "0.0.0.0/0"}, 
          {:type => "egress",  :protocol => "TCP", :startport => 23, :endport => 23, :cidrlist => "0.0.0.0/0"}
        ]
      }, 
      { :name         => "test",
        :description  => "Also created in Vagrantfile",
        :rules        => [
          {:type => "ingress", :protocol => "TCP", :startport => 80, :endport => 80, :cidrlist => "0.0.0.0/0"}, 
          {:type => "ingress", :protocol => "TCP", :startport => 443, :endport => 443, :cidrlist => "0.0.0.0/0"}, 
          {:type => "egress", :protocol => "TCP", :startport => 8080, :endport => 8080, :cidrlist => "0.0.0.0/0"}
        ]
      }
    ]
  end

[...]
```

Tested with cloud provider exoscale.ch but I haven't been able to test if there's any impact when using Advanced Networking.


Merry Xmas !