We are currently using VMware Vsphere with Satellite 6.1 and would like to be able to use Foreman to provision virtual machines in vCloud Air. Since we are using RHEL this would work well for us in regards to subscription and idm realm. Right now we have two different provisioning scenarios.

There seems to be fog support for this already.

https://github.com/fog/fog/tree/master/lib/fog/vcloud_director

Some background on vCloud Air's with Fog:

http://it20.info/2015/09/fog-io-and-vcloud-air/