Show all but list of unreturned minions with --summary

I was playing around with the new `cli_summary` setting in the master config (also available via `--summary` on the CLI), and decided that if I'm asking for a summary, just the number of minions which returned is not very helpful.  I can't imagine a time when I would want that number, but not also want the number of minions which did *not* return.

Now, when you pass in `--summary`, it will show everything except the line which enumerates exactly which minions didn't return.  That data will be added if the `-v` flag is included.