Add app/models to require_paths so metadata engines can access models for testing
Add app/models to require_paths so metadata engines can access models for testing

CDLUC3/stash,CDLUC3/stash,CDLUC3/stash_engine,CDLUC3/stash_engine,CDLUC3/stash,CDLUC3/stash_engine,CDLUC3/stash_engine,CDLUC3/stash