Revise usage of getquad()

Copied from !5 (merged):

We want also revise getquad() usage whether this is really needed at all places to accept almost-valid IP addresses:

lib/dns/rdata/generic/ipseckey_45.c
lib/dns/rdata/generic/l32_105.c
lib/dns/rdata/hs_4/a_1.c
lib/dns/rdata/in_1/a_1.c
lib/dns/rdata/in_1/wks_11.c

Again deprecating the usage of obscure formats might be the right thing to do.

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