Show max_parallell rollout info in job plan diff output

The output when planning a job update with max_parallell rollout set up is not very clear or intuitive.
If I set up "max_parallell = 1" for a group in my job, and I have 3 instances of that group, the output I get is this:

`
+/- Task Group: "taskGroup" (1 create/destroy update, 2 ignore)
`

This doesn't really give you the whole picture of what is about to happen, since all 3 instances in the group are going to be updated, and nothing is really ignored.

The above output should be clarified to something along these lines:
`
+/- Task Group: "taskGroup" (3 create/destroy rolling update, parallell = 1)
`