`setup.sh` enables Cloud APIs that are not required by all deployments

[stewartmiles]

spinnaker-for-gcp/scripts/install/setup.sh

Line 54 in 26455a6

REQUIRED_APIS="cloudbuild.googleapis.com cloudfunctions.googleapis.com container.googleapis.com endpoints.googleapis.com iap.googleapis.com monitoring.googleapis.com redis.googleapis.com sourcerepo.googleapis.com"

enables a load of Cloud APIs that are not required by default:

• Cloud Build (cloudbuild.googleapis.com): Only required if GAE is enabled via scripts/manage/add_gae_account.sh.
• Endpoints (endpoints.googleapis.com): Only required if the API endpoint is not customized (i.e IAP) in scripts/expose/configure_endpoint.sh.
• IAP (iap.googleapis.com): Only required if IAP isn't being used to expose Spinnaker in scripts/expose/configure_endpoint.sh.

[stewartmiles]

Also, it wasn't clear to me why this project needs to enable monitoring.googleapis.com, then I realized this was stackdriver monitoring

spinnaker-for-gcp/scripts/install/setup.sh

Line 227 in 26455a6

--num-nodes $GKE_NUM_NODES --enable-stackdriver-kubernetes --enable-autoupgrade \

of the Spinnaker cluster, some docs for this would be great. If monitoring is enabled but no one is looking at it because they didn't know about it, it's not very useful.