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Improved cttestsrv: maintain in-memory Trillian log. (#51)

This PR refactors the `cttestsrv` package and associated `ct-test-srv` binary to offer a more "realistic" CT log interface by maintaining an in-memory, low overhead, single process Trillian CT log. It is spiritually the same idea as Pebble compared to Boulder: We've stripped out much of the good engineering practice and abstraction from Trillian to make a simple to reason about test server suited to our purposes.

The test log implementation supports building and operating on two distinct in-memory trees, `treeA` and `treeB`. A management interface allows switching the active tree between `treeA` and `treeB`. This allows easily testing cases where a misbehaving log returns SCTs for leaves it will never integrate, and also allows for a case where STH to STH consistency cannot be proved because the underlying tree changes. The existing mock STH functionality is maintained and will supersede the active tree's true STH allowing the existing integration tests to operate as they were written.

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