fixes #2061 - test if oVirt API has HTTPS redirect

rest_client will refuse to follow redirects on POST requests, so the URL must
be entered as HTTPS. Don't require HTTPS as dev environments may be HTTP-only.

fixes #1886 adds Rackspace V2 support

Based on GregSutcliffe's initial pull request.

fixes #1899 require HTTPS URL for oVirt API, now HTTPS-only

fixes #1637 adds spice support

added vm name and cursor release instruction to the spice console title.
this is a follow up to 057d497

fixes #1589 provisioning vmware support

if the ovirt host uses spice now you can connect

add compute_resource.supports_update? to current provider set

Openstack images should show foreman defined images

at least for now as long as we don't support remote
fetching of images

basic openstack support

refs #1589, ensure that vmware public key is automaticilly imported when testing connection