[DM] [FIX] GKE template output error 
[DM] [FIX] GKE template output error 

Fixes #446 GKE template output error (nodeIpv4CidrSize)
GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit,GoogleCloudPlatform/cloud-foundation-toolkit