NSX integration fixes

> I had everything in other recipe called vmware_support.rb but it was duplicating a lot of code from l3.rb recipe and common_agent.rb.
> [..]
> I'm not insist with any solution, I would like to ask you about your idea how we should merger this.

Yeah, I guess it's hard to cleanly separate this, but for a start you could e.g. move this complete hunk to a separate vmware specific recipe and just do

```
if neutron[:neutron][:networking_plugin] == "vmware"
    include neutron::vmware_init
    # We don't need anything more installed or configured on compute nodes.
    # With NSX plugin no l3 agent is needed and neutron-server doesn't need 
    # anything else for working either.
    return
end
```
here. Move the installlation of the nsx specific packages to the new recipe as well if possible. Does that make sense?