Expose the networkType config in run_ocp

Make the networkType configurable depending on the
OCP version to use. For now, default to OpenShiftSDN.

OpenShiftSDN was deprecated in OCP 4.15 and
will be removed in OCP 4.16

Author: vkmc

cluster_config.sh.example

@@ -10,6 +10,11 @@ export SSH_PUB_KEY="`cat $HOME/.ssh/id_rsa.pub`"
 export MASTER_COUNT=3
 export WORKER_COUNT=3
 
+# Select the CNI plugin to use in your OCP deployment
+# From OCP 4.15 <, use OpenShiftSDN
+# From OCP 4.15 >=, use KubernetesOVN
+export OPENSHIFT_NETWORKTYPE="OpenShiftSDN"
+
 ##############################################
 # The following settings are platform specific
 ##############################################

run_ocp.sh

@@ -101,7 +101,7 @@ networking:
     hostPrefix: 23
   machineNetwork:
   - cidr: 10.0.128.0/17
-  networkType: OpenShiftSDN
+  networkType: ${OPENSHIFT_NETWORKTYPE}
   serviceNetwork:
   - 172.30.0.0/16
 platform: