Disable some failing tests

mysql-test/suite/galera/disabled.def

@@ -43,3 +43,4 @@ galera_gcs_fc_limit : Timeouts
 pool_of_threads: WSREP has not yet prepared node for application use
 galera_var_innodb_disallow_writes : Timeout
 galera.galera_kill_ddl : MDEV-17108 Test failure on galera.galera_kill_ddl
+MW-336 : nondeterministic wsrep_thread_count

storage/rocksdb/mysql-test/rocksdb/t/disabled.def

@@ -79,3 +79,6 @@ information_schema: MDEV-14372: unstable testcase
 
 mysqlbinlog_gtid_skip_empty_trans_rocksdb : MariaRocks: requires GTIDs
 autoinc_debug: Fails with wrong results
+drop_table: Hangs on shutdown
+allow_to_start_after_corruption : result difference and assertion failure
+index_merge_rocksdb2 : result difference