galera_sst_rsync_missing_stunnel galera_sst_rsync_encrypt_with_key reliably failing with raft

galera_sst_rsync_missing_stunnel fails simply because of expected but unsuppressed warnings.
galera_sst_rsync_encrypt_with_key fails because ssl-mode=DISABLED was explicitly set in the top galera_2nodes.cnf in b68e29a9c64 possibly trying to solve test configuration problem (lack of stunnel on test machines)