[enterprise-4.12] Replace image: gcr.io/google_containers/pause-amd64:3.0 with registry.access.redhat.com/rhel:latest in file scalability_and_performance/cnf-numa-aware-scheduling.adoc

Image in second container needs fixed as it seems that the entry point /bin/sh is not relevant for this image. What can be done is to replace pause image with registry.access.redhat.com/rhel:latest section https://docs.openshift.com/container-platform/4.12/scalability_and_performance/cnf-numa-aware-scheduling.html#cnf-scheduling-numa-aware-workloads_numa-aware.

Replace image: gcr.io/google_containers/pause-amd64:3.0 with registry.access.redhat.com/rhel:latest

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