Jetty directories in data/tmp

[Mike]

I've installed ArchivesSpace 3.3.1. I've noticed that in the archivesspace/data/tmp directory it creates the following set of directories every time you start ArchivesSpace:

jetty-0_0_0_0-8080-frontend_war-_-any-...
jetty-0_0_0_0-8081-public_war-_-any-...
jetty-0_0_0_0-8082-oai_war-_-any-...
jetty-0_0_0_0-8089-backend_war-_-any-...
jetty-0_0_0_0-8091-indexer_war-_aspace-indexer-any-...
jruby-PID

When you stop ArchivesSpace, only jruby-PID gets cleaned up. All of the jetty directories stick around.
Everytime you start ArchivesSpace you end up with 50MB in new jetty directories without the old ones being cleaned up.

Is it safe to delete the old jetty directories? Is there a configuration setting that I've missed that will clean this up automatically?

Thanks.