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another layer on top of the most popular cloud system like vsphere, xenserver or kdm

Strictly speaking they are not cloud systems but virtualization solutions, but yes, OpenStack provides an abstraction of a datacenter, including servers.

hence use my policy about creating and moving instances

What do you mean by that? Why can't you use your policy with "naked" vsphere, xenserver, KDM?

the company where I am going to install my software had already their cloud solution in use

In this case I am bit puzzled as to how you are going to add OpenStack to the picture.