[dns-operations] Don't use dnssec-signzone -g option...

[Ondřej Surý]

Hi,

I just found minor bug in dnssec-signzone which propagates itself
when '-g' is used - DS records are quietly ignored and dropped from
resulting .signed file.  (Bug already reported, but there could be
some other poor soul who may be saved from several hours of debugging
what's wrong.)

Ondrej.
-- 
 Ondřej Surý
 technický ředitel/Chief Technical Officer
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