Adding NSX API support in NSX integration

We would like to have fully automated process of NSX integration, including registration of compute nodes in NSX Manager.

To have it we would like to implement NSX API commands in barclamp-neutron
Some example:
- https://github.com/cloudbau/chef-nvp

You might want to make sure that `neutron[:neutron][:vmware][:controllers].split(",")` is not an empty array.