TritonDataCenter/triton-cns

Mixed case DNS zones cause lookup failures, SERVFAIL for authoritative zones

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Reported by @bhechinger, a case where the Triton datacenter name contained an upper case character, cns would not return names on any of the zones, nor even return axfr requests. After quite a bit of debugging, I've tracked this down to not converting forward zones to lower case while doing findZone().

The patch you provided me with works as expected, thanks!