Need to move object UUID creation into the indexer, rather than the ingester

[fsgeek]

The rationale for this is that we want to have multiple ingesters, but if the UUID is defined by one of the ingesters, the others become dependent upon that ingester.

The solution is to move the UUID generation out of the local ingester and put it into the local indexer. Then an ingester can depend just on the indexer file to generate additional ingest information.

[fsgeek]

Added commit db9779b to generate the UUID in the base indexer class. Still need to change ingester to use it if it is present.

[fsgeek]

Commit 8bafb75 handles an issue during testing where the st_birthtime field wasn't present. I have changed it to handle the instance where any time field is not present. The change I made previously (for Windows) that uses the UUID is working as expected. Hopefully it will work for the other platforms as easily.