"net arp flush" has been there since the beginning but "net nbr" never
grew the same subcommand, even though the IPv6 side has been able to
clear its cache for a while. Add it, so the two families are reachable
the same way from the shell.
Add "net arp del" as well, to pair with "net arp add". Removing the one
entry that has gone stale is what a user reaching for the flush usually
wants, and it is the only way to take back an entry that "net arp add"
pinned, since the flush now keeps those. "del" is the verb the other net
subcommands use for this.
Point both flushes and the neighbor removal at the public API instead of
the subsystem internals, and show in "net arp" which entries are static,
so the help text saying they survive a flush can be checked.
Assisted-by: Claude:claude-opus-5
Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
cef28b8ad4