OSDOCS-6223 amending IAM service account in GCP roles, removing OWNER role for creating a cluster on GCP

Author: fmcdonal

modules/osd-create-cluster-ccs.adoc

@@ -60,10 +60,13 @@ The project name must be 10 characters or less.
 ====
 * You have enabled the Google Cloud Resource Manager API in your GCP project. For more information about enabling APIs for your project, see link:https://cloud.google.com/endpoints/docs/openapi/enable-api[the Google Cloud documentation].
 * You have an IAM service account in GCP called `osd-ccs-admin` with the following roles attached:
+  ** Compute Admin
   ** DNS Administrator
+  ** IAM Security Admin
+  ** Service Account Admin
+  ** Service Account Key Admin
+  ** Service Account User  
   ** Organization Policy Viewer
-  ** Owner
-  ** Project IAM Admin
   ** Service Management Administrator
   ** Service Usage Admin
   ** Storage Admin