Description of problem:
OCPBUGS-3499 and OCPBUGS-3501 both require a more recent version of openshift/library-go containing the shared validation and host-assignment logic.
CRD-based and openshift-apiserver-based Route validation/defaulting must use the shared implementation
Complete Route API compatibility
openshift/kubernetes#1414: OCPBUGS-3503: [release-4.12] UPSTREAM: <drop>: Bump library-go.
openshift/kubernetes#1423: OCPBUGS-3503: UPSTREAM: <drop>: Bump library-go.