TLS, Merge Delay Metrics, Easier Admin Tests

The API protos have been rebuilt with gRPC 1.3.

Timestamps have been added to the log leaves in the MySQL database. Before upgrading to this version you must make the following schema changes:

• Add the following column to the LeafData table. If you have existing data in the queue you might have to remove the NOT NULL clause: QueueTimestampNanos BIGINT NOT NULL

• Add the following column to the SequencedLeafData table: IntegrateTimestampNanos BIGINT NOT NULL

The above timestamps are used to export metrics via monitoring that give the merge delay for each tree that is in use. This is a good metric to use for alerting on.

The Log and Map RPC servers now support TLS.

AdminServer tests have been improved.