MDEV-10455: libmariadbclient18 + MySQL-python leaks memory on failed connections

Support of CLIENT_REMEMBER_OPTIONS and freeing options added.

sql-common/client.c

@@ -3644,6 +3644,8 @@ error:
     /* Free alloced memory */
     end_server(mysql);
     mysql_close_free(mysql);
+    if (!(client_flag & CLIENT_REMEMBER_OPTIONS))
+      mysql_close_free_options(mysql);
   }
   DBUG_RETURN(0);
 }
@@ -3714,7 +3716,7 @@ my_bool mysql_reconnect(MYSQL *mysql)
   }
   if (!mysql_real_connect(&tmp_mysql,mysql->host,mysql->user,mysql->passwd,
 			  mysql->db, mysql->port, mysql->unix_socket,
-			  mysql->client_flag))
+			  mysql->client_flag | CLIENT_REMEMBER_OPTIONS))
   {
     if (ctxt)
       my_context_install_suspend_resume_hook(ctxt, NULL, NULL);

sql/slave.cc

@@ -6061,7 +6061,7 @@ static int connect_to_master(THD* thd, MYSQL* mysql, Master_info* mi,
 #ifndef DBUG_OFF
   mi->events_till_disconnect = disconnect_slave_event_count;
 #endif
-  ulong client_flag= 0;
+  ulong client_flag= CLIENT_REMEMBER_OPTIONS;
   if (opt_slave_compressed_protocol)
     client_flag=CLIENT_COMPRESS;                /* We will use compression */