Remove unused network_api.get_instance_uuids_by_ip_filter()

Last usage was removed in ae781ee97947c33d6d43e4c21df4f338c875bf1c

Change-Id: I33dc14085ca0c887778c7379f0498714e8d30425
Merge "Remove unused network_api.get_instance_uuids_by_ip_filter()"