NSX integration fixes

What about this:
```ruby
floating_network_type = ""
fixed_network_type = ""

unless node[:neutron][:networking_plugin] == "vmware"
  if node[:neutron][:networking_mode] == 'vlan'
    fixed_network_type = "--provider:network_type vlan --provider:segmentation_id #{fixed_net["vlan"]} --provider:physical_network physnet1"
    if node[:network][:networks][:nova_floating][:use_vlan]
      floating_network_type = "--provider:network_type vlan --provider:segmentation_id #{floating_net["vlan"]} --provider:physical_network physnet1"
    else
      floating_network_type = "--provider:network_type flat --provider:physical_network physnet1"
    end
  end

  if node[:neutron][:networking_plugin] == "openvswitch"
    if node[:neutron][:networking_mode] == 'gre'
      fixed_network_type = "--provider:network_type gre --provider:segmentation_id 1"
      floating_network_type = "--provider:network_type gre --provider:segmentation_id 2"
    else
      fixed_network_type = "--provider:network_type flat --provider:physical_network physnet1"
    end
  end
end
```