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Network Error Logging e707a786d1c0

Handle errors in different phases differently (#83) This patch clarifies the different phases that happen while servicing a request. A network error occurs during one of those phases, and we now handle errors differently depending on which phase they occur in: - `include_subdomains` policies can only be used to generate reports about DNS resolution errors, since the policy author can only confirm ownership of the DNS tree, and not of all of the servers that those domain names resolve to. - If the resolved IP address for an origin changes between when a policy is received, and when its used to generate a report, we don't report any details about the connection and application phases, and only report that the IP address changed. This prevents DNS rebinding attacks. Issue: #74

Douglas Creager