add compact warnings as well

Author: wyardley

infra/build/developer-tools/build/scripts/task_wrapper_scripts/terraform_validate

@@ -19,5 +19,5 @@
 # files to validate.  This directory is assumed to be a root module.
 
 set -eu
-flock -x /workspace/.terraform.lock -c "terraform init -upgrade -chdir=$1 -backend=false >/dev/null"
+flock -x /workspace/.terraform.lock -c "terraform init -compact-warnings -upgrade -chdir=$1 -backend=false >/dev/null"
 flock -s /workspace/.terraform.lock -c "terraform -chdir=$1  validate"