These should not be bundled into the link_up() operation, as that is not (currently) called during interface configuration if the interface already is IFF_UP, which is unrelated to the need to change the mac to a user-defined value, or set 'nomaster' on the interface. Additionally, there is no need to re-set the mac or re-assert nomaster every time the interface is brought up; those should be only part of normal initial interface configuration. Fixes: #17391
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