Description of problem: ovirt-guest-agent-gdm-plugin packages an extension to the simple GDM greeter. By default GDM now uses the shell-based greeter. Therefore, I assume that this package doesn't work OOTB in F19 (or F18, for that matter). Version-Release number of selected component (if applicable): 1.0.6-6.fc19 How reproducible: Have not specifically tested. Assuming based on what's packaged, and the fact that it doesn't appear to modify gdm's config anywhere to switch back to the simple greeter.
The package has been removed for F19 and we'll have it hopefully back for F20 with changes u/s merged (https://git.gnome.org/browse/gnome-shell/commit/?id=4cda61a16a49fee44cb2112b25931647d7d7141e) to support SSO
Fixed with ovirt-guest-agent-gdm-plugin-1.0.9-1.fc20