FreeNAS/freenas c17ecd9src/freenas/etc netcli

fix(netcli): basic validation of VIP

There are a number of ways we could do this better but it is not worth
the effort. We really need a netcli rewrite using middlewared.

Ticket: #25526
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+29-10src/freenas/etc/netcli
+29-101 files

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