Introducing a new scannable artifact file type requires restart in order for some consumers to work

to replicate:

1. copied Nunit artifact (see attached zip file) to internal repository
2. removed metadata and checksums of the artifact
3 execute 'touch' to the artifact folder recursively: find NUnit.Framework | xargs touch
4. add "*/.dll" to Repository Scanning -> File Types -> artifacts
5. click 'Scan Repository'
6. Checksums of the dll artifact are not generated.

restarting Archiva and repeating steps 2 to 5 will produce the checksums of the dll artifact.