Fix DonDominio service response treatment #646
Merged
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This PR fixes a bug in handling the response from DonDominio service.
According to DonDominio documentation when the DNS update has succeeded the service returns "OK" and, if the IP has changed, it returns an additional line with "IP:x.x.x.x.x". Also, in practice, the service always returns this line with IP as the last line, which causes ddclient to report the update as a failure because the last line is not the string "OK".
This PR corrects this behaviour.