* add script to bump k8s deps * bump k8s to v1.17.6
With a minimum K8s version of 1.14 (starting in 0.10), 1.15.3 puts us in the center of the +/-1 version window of support. /hold
* Add the initial caching type definitions. This is largely carried over from https://github.com/knative/serving/pull/1972 * Incorporate feedback from @evankanderson * Add the CRD for the type definition.