Updated tests for external_name and external_db.
Updated tests for external_name and external_db.

muffato/ensembl,mjg17/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,at7/ensembl,danstaines/ensembl,at7/ensembl,at7/ensembl,danstaines/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,muffato/ensembl,at7/ensembl,Ensembl/ensembl,muffato/ensembl,Ensembl/ensembl,muffato/ensembl,willmclaren/ensembl,willmclaren/ensembl,danstaines/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,Ensembl/ensembl