Only overwrite gcloud command if it exists (#276)
Only overwrite gcloud command if it exists (#276)

Application default credential config does not have
cmd-path set. The old code incorrectly set a new cmd-path,
which would make credential refreshing fail.
janetkuo/marketplace-k8s-app-tools,GoogleCloudPlatform/marketplace-k8s-app-tools,GoogleCloudPlatform/marketplace-k8s-app-tools,janetkuo/marketplace-k8s-app-tools