Description of problem:
currently with colonizer, when we create gluster setup with the volume based on deployment theme, the name assigned to the volume is done by colonizer.
Instead we must prompt the user to give a name to the volume.
We don't have a way to rename a volume in gluster in general, and hence user will have to live with that name for ever.
Instead leave it to the user or if user doenst enter anything , then default it to a random name.
This bug was originally raised as part of BZ#1535403 - Allow user to choose or mention the volume name
However, the fix in BZ#1535403 only allows modifying yaml file before deploying, which does solve the problem to an extent. However it would be more flexible to prompt user as part of workflow instead of editing yaml files.