Switch the command pattern to match the common command scheme
where the entity name (network name) follows the command family name:
From
known-network forget <network name>
To
known-network <network name> forget
In addition, it extracts the network match by name logic into its
own function for the further reusability. In the case of ambiguity
between the network objects with the same SSID but different security
types the logic asks to specify the security type in addition
to the network name as follows:
known-network <network name.security> forget
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