[WIP] 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

Don't we need to reload the gem path after installing the package? See https://github.com/vuntz/barclamp-ceilometer/commit/cb34b376de1c3df5ba684f7a4c2576a01ef2a661 for instance