Build only once with Bazel. (#1163)
Build only once with Bazel. (#1163)

With Bazel we are building the code 2 times when
TEST_BAZEL_AS_DEPENDENCY=yes.  That is super slow and contributes to
long (and sometimes failed) build times.
googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp,googleapis/google-cloud-cpp