The sst script reads the mariadb-10.0 and mysql-10.0 section of the configuration file even in the 10.1+ versions of mariadb.
trivial and lazy patch:
https://github.com/MariaDB/server/compare/10.1...grooverdan:10.1-wsrep_sst_rsync_read_MYSQL_BASE_VERSION_config (I submit this under the MCA).
Of course something like my_print_defaults --mysqld would be better.
galera_recovery.sh also misses groups with version numbers by not using --mysqld.