romana-setup should require or ask to confirm the devstack name....

[chrismarino]

I'm pretty sure the old version of the PoC CloudFormation would create a new cluster each time it ran. Assumed this same behavior with romana-setup. I changed the number of Compute Nodes in file from 1 to 3 and ran romana-setup expecting a new second cluster to start.

What actually happened was that my original cluster was modified to add 2 more Compute Nodes. That's great, but it clobbered my first cluster. OK in this case, but probably not the best default behavior. I think we should require a devstack name in the command line to be sure they know the target of the script.

However, this could also lead to problems if there is a typo, so maybe the script when run with no name echos the name and then asks to confirm.....

[cgilmour]

OK. I'll see if I can add a step to it.