OpenWrt 21.02.0 third release candidate

[Fiouz]

@grrr2

the moment I press 'Add' eth1:untugged turns to tagged:

Seems related to this recent fix in LuCI, which does not seem backported to the 21.02 branch yet.

See also:

Help setting up LAN and two VLAN's over same adapter (mvebu + DSA)

Fixes pushed.

Help setting up LAN and two VLAN's over same adapter (mvebu + DSA)

You should be able to cleanly cherry pick those two commits (in the same order as written above). I'll do another backport round for openwrt-21.02 in the next days, but I want to wait for LuCI master to settle first.