Port function state can have either of the two values - active or
inactive. Update the documentation and help command for these two
values to tell user about it.
With the introduction of state, hw_addr and state are optional.
Hence mark them as optional in man page that also aligns with the help
command output.
Fixes:
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|---|---|---|
| .. | ||
| man3 | ||
| man7 | ||
| man8 | ||
| Makefile | ||