feat: convert Terraform configuration from plain files to modules (#1054)

Replace 'loging' with 'login' in tutorial and README instructions and adds "create" command in markdown. (#1047)
Fixes errors (#1045) and refactors use of kustomize path in CLI.
Makes GKE+ASM provisioning a module.
Makes Online Boutique provisioning a module.
Creates a new 'main.tf' TF configuration to provision modules sequentially, because of the hard dependency there is no effective way to paralelize it.
Refactors "online-boutique" to replace with "microservices-demo".

Author: minherz

provisioning/kustomize/online-boutique/kustomization.yaml renamed to provisioning/kustomize/microservices-demo/kustomization.yaml

@@ -112,11 +112,15 @@ resource "google_monitoring_slo" "service_latency" {
   ]
 }
 
+data "google_project" "info" {
+  project_id = var.gcp_project_id
+}
+
 module "slo_service" {
   count  = length(local.slo_services)
   source = "./slo_service"
 
-  project_number = var.gcp_project_number
+  project_number = data.google_project.info.number
   name           = local.slo_services[count.index].id
 }