MDEV-15845 Test failure on galera.galera_concurrent_ctas

While executing CTAS galera applier thread can cause CTAS to abort and rollback. Rollback can take time causing applier thread to shutdown node after serial unsuccessful retries to apply transaction. Don't set lock_wait_timeout to zero to wait for lock.

sql/sql_base.cc

@@ -4379,6 +4379,10 @@ lock_table_names(THD *thd, const DDL_options_st &options,
     mdl_requests.push_front(&global_request);
 
     if (create_table)
+    #ifdef WITH_WSREP
+      if (thd->lex->sql_command != SQLCOM_CREATE_TABLE &&
+          thd->wsrep_exec_mode != REPL_RECV)
+    #endif
       lock_wait_timeout= 0;                     // Don't wait for timeout
   }