Atmire 2430 - Provide fix for Journal Indexing

The following PR is to provide a fix for missing FileIndexer and LocalIndexer classes needed to repopulate the Journals solr index in the old startegy prior to including the Journals migration changes.

This PR has configuration that will need to be removed when the new Editable Authority Control based JournalDB is merged in PR-721 (https://github.com/datadryad/dryad-repo/pull/721)
dspace/modules/api/src/main/resources/spring/spring-dspace-core-services.xml