Comment 5 for bug 1394755

There's potentially significant work to implement support for allowing existing machines to be converted to state servers. The workflow associated with provisioning a machine is not set up to change a machine's role to being a state server after it has already been set up. We'd need to change that, plus install mongo, plus convert any existing non state server config in the case where the machine was provisioned to run units, plus ensure there's no conflict if there are units installed etc. It's all quite messy.