Description of problem:

command: 

[oVirt-shell:connected]# create datacenter --name "TEST" --storage_type "nfs" --version "3.0"

error:

unknown error: unbound method export() must be called with Version instance as first argument (got StringIO instance instead)

git commit: ed00a08d51006b1b90923cb9d89b57b1e4d02be2