fix #11877: move import logs to upload jobs instead of annotations

Fixes http://trac.openmicroscopy.org.uk/ome/ticket/11877 to make import logs attached to a fileset's upload job instead of being a file annotation on it; the import log's original file has a distinct MIME type. The upgrade script from RC1 now includes PL/pgSQL for moving legacy import logs accordingly.

Ensure that the new integration tests run and pass in http://ci.openmicroscopy.org/job/OMERO-5.0-merge-integration-java/lastCompletedBuild/testngreports/integration/integration.MetadataServiceTest/.

In testing, make sure that import logs can still be viewed from Insight, and that they indeed no longer exist as annotations in the database.