fetch_failed_workers() is dropped as no longer used, get_hive_current_load() cosmetically touched
fetch_failed_workers() is dropped as no longer used, get_hive_current_load() cosmetically touched

Ensembl/ensembl-hive,Ensembl/ensembl-hive,Ensembl/ensembl-hive,Ensembl/ensembl-hive