update gffSerialiser tests to drop ontology adaptor requirement
update gffSerialiser tests to drop ontology adaptor requirement

james-monkeyshines/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,muffato/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,muffato/ensembl,muffato/ensembl,Ensembl/ensembl,muffato/ensembl