Comment 1 for bug 1527939

i think this could be an issue with the image from tarballs.openstack.org having a different guestagent version than what is expected from the trove control plane installation.

I'd recommend building an image for your installation rather than using a pre-made version. Here is some details on how to build an image.
http://docs.openstack.org/developer/trove/dev/building_guest_images.html