REIVEW: [NX-518] Orient database manager

This PR addresses the following issues:

https://issues.sonatype.org/browse/NX-518
https://issues.sonatype.org/browse/NX-519
https://issues.sonatype.org/browse/NX-542
See the support-zip for capabilities.  This will make the export in this location, so that support folks can move work/* to sonatype-work/nexus/* and start up the server and get the database to re-materialize from the export.