Adding cisco-n1kv support in astapor/foreman

I have made changes which required in foreman to install cisco nexus1000v plugin. I validated my changes with ICE HOUSE RDO in RHEL 7 controller and ICE HOUSE RDO in RHEL6.5
i will reorder the parameters in alphabetical order.
Yes this config change in horizon is only for n1000v plugin. I can move it to controller under core_plugin condition if you think it'll provide better organization.