add(coreos-base/oem-niftycloud): added initial oem for niftycloud

These are the initial oem scripts for niftycloud.
NIFTY Cloud is one of the most popular public cloud service in Japan.

cc: @kelseyhightower 
Ok. Could you just confirm that it is `RequestBroadcast=true` that is the problem by adding it to your unit?

The reason why it is in there is just to fix desktop VMs with "bridged networking" enabled. If that breaks other vmware platforms/configurations then I wonder if there is another way we can fix it or detect when that flag is required.