ncm-spma: improve yum locked_all_packges message logging

fixes #376
Why this `?` ? You are joining, and both sides of the expression look like the same thing in list context.

OTOH, I wonder if `sprintf` wouldn't make this a little easier to read:

```perl
return sprintf("%d wanted packages with wildcards: %s, %d non-exact matched packages from repoquery: %s",
    $nr_wnated_locked, join(" ", @$wanted_locked), $nr_not_matched, join(" ", @$not_matched_ref));
```