ElMenu: update activedIndex/openedMenus when items changes, fix #2670 #3671
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The current problem is, many people need to dynamic generate menu-items. however, when one watch default-active, the menu may still not generated, when the menu generated, one need to change the value the default-active is and turn it back to make the watch work. eg.
its quite a dirty workaround. So maybe menu component should watch items change and apply updateActive automaticly.