It isn't obvious that the collector at the repo base doesn't write to GCP

[dashpole]

A user simply following the commands in the repo readme installs a collector that uses the logging exporter. This isn't called out very clearly, and at least one user was surprised that the GoogleCloud sample doesn't write to google cloud. We either need to:

• Make it clearer that it doesn't write to google cloud, or
• Make the "default" sample write to google cloud

[aabmass]

• Make the "default" sample write to google cloud

Discussed in issue triage, this would probably be the best approach to make them all go to GCP by default.