Update cluster maximums for OpenShift 4.6
Update cluster maximums for OpenShift 4.6

This commit updates the cluster tested maximums based on the Performance
and Scale testing done for OpenShift 4.6 including number of nodes and
number of pods per cluster.

vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs