[Ovirt-devel] HostController -> Service (take 3)

[David Lutterkort]

This iteration of the host controller refactoring changes error handling
once again, since the previous patch had some serious errors in that area.

We now have a catch-all error handler, responding to Exception, that pulls
validation errors out of the instance variables of the controller. In the
future, we might want to refine that to handle validation errors separately
from Exception (handling Exception really points to a bug in the app)

David