Limit GCP subnet secondary alias names to 63 chars

[rifelpet]

This should fix these GCP jobs that have long cluster names:

https://testgrid.k8s.io/kops-gce#ci-kubernetes-e2e-cos-gce-reboot-canary

Error: error running tasks: deadline exceeded executing task Subnet/us-central1-e2e-e2e-ci-kubernetes-e2e-cos-gce-reboot-can-a1ernl. Example error: error creating Subnet: googleapi: Error 400: Invalid value for field 'resource.secondaryIpRanges[1].rangeName': 'services-e2e-e2e-ci-kubernetes-e2e-cos-gce-reboot-canary-k8s-local'. Must be a match of regex '(?:[a-z](?:[-a-z0-9]{0,61}[a-z0-9])?)', invalid

kops/pkg/model/gcemodel/context.go

Lines 75 to 78 in 3aad69c

	// SafeSuffixedObjectName returns the object name and cluster name escaped for GCE, limited to 63 chars
	func (c *GCEModelContext) SafeSuffixedObjectName(name string) string {
	return gce.ClusterSuffixedName(name, c.Cluster.ObjectMeta.Name, 63)
	}

[k8s-ci-robot]

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