Change the default result for CT Verification to "Not verified"

When default constructing a CTVerifyResult, set the result to indicate
that there were not enough SCTs. This matches a reasonable 'fail closed'
implementation for CT status.

BUG=none
R=estark@chromium.org, mattm@chromium.org

Review-Url: https://codereview.chromium.org/2066643002
Cr-Commit-Position: refs/heads/master@{#399594}
1 file changed