Disabling tests mentioned in MDEV-11229 galera.MW-258 galera.galera_as_master fail in buildbot

Author: Alexander Barkov

mysql-test/disabled.def

@@ -22,3 +22,9 @@ innodb-wl5522-debug-zip  : broken upstream
 innodb_bug12902967       : broken upstream
 file_contents            : MDEV-6526 these files are not installed anymore
 max_statement_time       : cannot possibly work, depends on timing
+galera.MW-258              : MDEV-11229
+galera.galera_as_master    : MDEV-11229
+galera.MW-44               : MDEV-11229
+galera.galera_gcs_fc_limit : MDEV-11229
+galera.galera_roles        : MDEV-11229
+galera.galera_lock_table   : MDEV-11229