GCP: Add Stackdriver setup to GCP/GKE setup script for #41

[rtannenbaum]

We will provide a generic Java interface for metrics writing for #41. For GCP, we will hook this up to write to Stackdriver.

Stackdriver includes logging and monitoring agents for VMs. This monitors some metrics for free such as CPU utilization.

We should script the creation of a Stackdriver account (or point to an existing one) in our GCP project setup script

We should also add a VM startup script:
https://cloud.google.com/compute/docs/startupscript

and include Stackdriver agents in the VM start up script:

To install the Stackdriver monitoring agent:

$ curl -sSO https://repo.stackdriver.com/stack-install.sh
$ sudo bash stack-install.sh --write-gcm

To install the Stackdriver logging agent:

$ curl -sSO https://dl.google.com/cloudagents/install-logging-agent.sh
$ sudo bash install-logging-agent.sh

[rtannenbaum]

Actually by enabling Stackdriver in the GCP project, and creating an account name (= project name) and starting the free trial, it automatically started reporting the builtin metrics.

So luckily, no VM/startup script adjustment is necessary

We should still script the enabling of Stackdriver in the GCP/GKE setup script