Update googleapis for CMake. (googleapis/google-cloud-cpp-spanner#70)
Update googleapis for CMake. (googleapis/google-cloud-cpp-spanner#70)

Use the version of google-cloud-cpp that has the right googleapis.

Fix a couple of TODOs in the spanner tool, mostly to show that we do
have a version of googleapis suitable to compile Spanner.
googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp