feat: Add new gcloud commands, API clients, and third-party libraries across various services.

gcloud auth application-default login/google-cloud-sdk/platform/ext-runtime/nodejs/testing.md

@@ -0,0 +1,22 @@
+
+Testing Notes
+=============
+
+To run the test script (`test/runtime_test.py`) you'll need to install the
+Google Cloud SDK add this to your PYTHONPATH:
+
+    export PYTHONPATH=$CLOUD_SDK/lib:$CLOUD_SDK/platform/google_appengine:$PYTHONPATH
+
+Where `$CLOUD_SDK` is the location where the cloud SDK is installed.
+
+Debugging
+---------
+
+If you do "sys.stderr.write(...)" from a plugin script, your output will go
+to a nice shiny bright warning message.  Exceptions will show up as warning
+messages simply by virtue of having been formatted to standard error.
+
+Full logging can be made to happen by adding:
+
+    from googlecloudsdk.core import log
+    log.SetVerbosity(logging.DEBUG)