WDS stopped working in 21.02, looking for bug in netifd

[Daniel Haid]

By the way, maybe I should add that both devices are GL.iNet GL-AR150.

Also, the configs are only minimally different from the defaults. The 
only option that could be a bit unusual is having 802.11r enabled.

And indeed, after disabling 802.11r, the bug occurs much less often. In 
fact, without 802.11r, I have not seen the bug for several restarts. I 
thought I saw the bug once even with 802.11r disabled, but I am not so 
sure anymore. I now did another dozen restarts (with 802.11r disabled), 
and the connection always works. Maybe the one time I thought I saw the 
bug I just wrote "ping" too quickly.

I enabled 802.11r again, and the bug appeared again after only one 
restart. It feels like it is not a coincidence.

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D.H.