Certificate Transparency: Add Venafi log

- Adds Venafi log to known CT logs.
- Expands log key size to accommodate large Venafi public key.
- Calculates number of known logs, rather than hard-coding.

R=rsleevi@chromium.org
BUG=499446

Review URL: https://codereview.chromium.org/1338393002

Cr-Commit-Position: refs/heads/master@{#349170}
2 files changed