revert the S3/pg_basebackup choice to unconditionally prefer S3 for testing purposes.
revert the S3/pg_basebackup choice to unconditionally prefer S3 for testing purposes.

jinty/patroni,pgexperts/patroni,sean-/patroni,pgexperts/patroni,sean-/patroni,jinty/patroni,zalando/patroni,zalando/patroni