Add missing class

... in order to fix:
```
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Loading facts
Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Could not find resource 'Class[Mrepo::Repos]' for relationship from 'Class[Mrepo::Selinux]' on node foobar
Warning: Not using cache on failed catalog
Error: Could not retrieve catalog; skipping run
```