template_upload script changes

This is a work-in-progress PR following the updates of template upload scripts:

template_upload_all
template_upload_rhevm
template_upload_rhos
template_upload_vsphere

EDIT: all right, this should work now. I'm making change to cfme_data for this to work properly. It still needs some minor changes + docstrings, that should be it.
Also, I recommend running the vsphere script from somewhere on the vsphere subnet. The ovftool has a problem otherwise.
EDIT2: It's done.