improving zonec performance on many zones

[Erik Rozendaal]

fujiwara at jprs.co.jp wrote:
> 
> This patch needs more memory space(number of ownernames * sizeof(pointer)).
> But large number of zones case, it improves "zonec" performance.

If you are sure every zone is passed to zonec only once (the usual case) 
you can simply always start a new zone when a SOA record is encountered 
by applying the attached patch. This avoids the memory overhead of 
another pointer in domain_type.

In the future NSD will use a binary search instead here, so that should 
also solve this performance problem.

Erik
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