Update image paths to use configured static URL
Reingest: Add reingest METS structure

refs #6495

Add new client script for making reingest related changes. Call it from
createMETS2 if the SIP type indicates it's a reingested AIP. Move the code
to write out the METS into its own function so it can be called separately.

If creating a METS file fails, fail the SIP.
Reingest: Update METS for DC changes

refs #6495

Update or add new SIP-level DC metadata for reingested AIPs.