Allow node-exporter port through GCP firewall

Add the node-exporter port to the GCP firewall allow list to enable
scraping the metrics endpoint.

roles/openshift_gcp/templates/provision.j2.sh

@@ -63,7 +63,7 @@ declare -A FW_RULES=(
   ['ssh-internal']='--allow tcp:22 --source-tags bastion'
   ['master-internal']="--allow tcp:2224,tcp:2379,tcp:2380,tcp:4001,udp:4789,udp:5404,udp:5405,tcp:8053,udp:8053,tcp:8444,tcp:10250,tcp:10255,udp:10255,tcp:24224,udp:24224 --source-tags ocp --target-tags ocp-master"
   ['master-external']="--allow tcp:80,tcp:443,tcp:1936,tcp:8080,tcp:8443${range} --target-tags ocp-master"
-  ['node-internal']="--allow udp:4789,tcp:10250,tcp:10255,udp:10255 --source-tags ocp --target-tags ocp-node,ocp-infra-node"
+  ['node-internal']="--allow udp:4789,tcp:10250,tcp:10255,udp:10255,tcp:9000-10000 --source-tags ocp --target-tags ocp-node,ocp-infra-node"
   ['infra-node-internal']="--allow tcp:5000 --source-tags ocp --target-tags ocp-infra-node"
   ['infra-node-external']="--allow tcp:80,tcp:443,tcp:1936${range} --target-tags ocp-infra-node"
 )