Add a number of missing examples to CI build. (#2444)
Add a number of missing examples to CI build. (#2444)

A number of the examples were not being run as part of the CI build.
If you are wondering, a little birdy called "code coverage" told me
about these.
googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp