WEP networks are not supported by iwd. However, the only indication is the
message "Operation not supported" while trying to connect. It is not clear
enough that this is due to intentional lack of support (as opposed to some
kind of misconfiguration). This patch explicitly lists WEP networks shown
with get-networks as unsupported. Hopefully this will make it clearer for
those of us not as familiar with iwd.
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