No code change, reformat.
NEXUS-5658: Copy+Paste of FSDirectory selection from Indexer

This commit merely copy-pastes the FSDirectory selection
from the DefaultIndexerManager of nexus-indexer-lucene-plugin
Merge pull request #797 from sonatype/nexus-5658-timeline-fsdirectory-type

[2.5] NEXUS-5658: timeline plugin does not honour lucene.fsdirectory.type property