Switch from install-logging-agent.sh to add-logging-agent-repo.sh. (#337)
Switch from install-logging-agent.sh to add-logging-agent-repo.sh. (#337)

This reverts #336 and reinstates #335.
This reverts commit fa66b74a578575a6130fecf91887ae8f9c97369c.

A new version of the `add-logging-agent-repo.sh` script was released
that supports `DO_NOT_INSTALL_CATCH_ALL_CONFIG`.
GoogleCloudPlatform/google-fluentd,GoogleCloudPlatform/google-fluentd,GoogleCloudPlatform/google-fluentd