This does not appear to have anything specific to do with MAAS. This is a known issue with ensure-availability. I changed the bug title to reflect that. The problem is that the second time you run ensure-availability, we look to see if we have a quorum of state servers, see that we don't, and so we try to rectify the situation by adding more.... currently we don't have a way to say "hey, we're still trying to bring up some new servers, so just hold your horses!"
This does not appear to have anything specific to do with MAAS. This is a known issue with ensure- availability. I changed the bug title to reflect that. The problem is that the second time you run ensure- availability, we look to see if we have a quorum of state servers, see that we don't, and so we try to rectify the situation by adding more.... currently we don't have a way to say "hey, we're still trying to bring up some new servers, so just hold your horses!"