change group assignment in 'Copy Archived Files to Production' processor

[MatthewStephens]

Looks like the sysadmins have removed the group 'lb-ds' from the tracking system, leading to errors in a processor:

copy_archived_files_to_production_processor.rb

The FileUtils.chown calls are throwing the errors.

We should change this to 'lb-digiserv', as that seems to be in common use.

[sdm7g]

I'm closing this.
There is a group lb-ds currently on tracksys -- perhaps this was added by BobG at Matt's request.
I don't see any recent errors from chown calls since Jan 2014, so I'm guessing this has been fixed.
I do see some errors from chmod calls which are probably a different issue.