Automate Transfers: Remove cwd hack
Automate Transfers: Add another pre-transfer script

refs #7369

Create metadata.json based on directory name.
Automate Transfers: Can start transfers from subdir of ts_path

Add ability to start transfers from directories that are not the immediate
children of ts_path.  Depth param specifies how many directories to go down
before creating transfers.  Default is 1, which mimics old behaviour and
creates transfers from the children of ts_path.