[Swan-dev] virtual %4 notation mistake

[D. Hugh Redelmeier]

I'm looking at (tidying) programs/pluto/virtual.c

_read_subnet() accepts a notation for the AF:
	%v6 for AF_INET6 (IPv6)
	%v4 for AF_INET (IPv4)

It also reluctantly accepts %4 for AF_INET.
This code is commented:
	/* workaround for typo "%4:" instead of "%v4:" introduced in old openswan release*/
and logs a (not-too-explicit) RC_LOG_SERIOUS warning.

Can we ditch this?

BTW, shouldn't the code be able to guess the AF from the syntax, without 
needing a prefix?

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Do we need a registry of obsolete stuff so we can find it and delete it 
when it is time?