Update import for create_mets_v2
Update import for create_mets_v2

`create_aic_mets.py` was still referring to the old name for this
script (which was changed as a part of the MCP batching work.)

Fixes https://github.com/archivematica/Issues/issues/35

artefactual/archivematica,artefactual/archivematica,artefactual/archivematica,artefactual/archivematica