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Issue description

• fig 27 SDN does not match classroom configuration. network should be 10.8.0.0/14 and not 10.128.0.0/14
• fig 29 and fig 30 do use the correct SDN so there is an inconsistency between the graphics
• fig 31 goes back to using 10.128.0.0/14 again  when it should be 10.8.0.0/14
• there is an additional problem with fig 31 in that given the learning point of recognising the 3 replicas that the service is load balancing to two of them have a description of APP and one has a description of DB for no reason that I can understand. Unless there is a good reason for the different names (in which case it should be explained in the student guide) all the replicas should be called the same thing 
• fig 32 also shows the wrong subnet and also shows the inconsistent pod names
• in the section 'the openshift cluster network operator' the oc describe network.config/cluster output shows the incorrect subnet for the cluster, i.e. 10.128.0.0/14
• the Jira  https://issues.redhat.com/browse/PTL-14944 raised for 4.14 also partially covers the same problem

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