pkgng ansible module seems to fail when packages are supplied with prefix, but only when package name contains a dash

does not work:
```
django_extra_os_dependencies:
  - "math/coin-or-cbc"
```

works:
```
django_extra_os_dependencies:
  - "coin-or-cbc"
```

works:
```
django_extra_os_dependencies:
  - "lang/rust"
```

works:
```
django_extra_os_dependencies:
  - "rust"
```