OCPEDGE-1749: [TNF] Reworked TNF logic to render fencing block conditionally.

Two Node OpenShift with Fencing (TNF) is a deployment topology with two
control-plane nodes that was introduce as a Dev Preview in OpenShift
4.19. This commit updates the logic around TNF to only render fencing
credentials in releases 4.19 and up, and also the sslInsecure parameter
so that it uses certificateVerification in 4.20 and up, as introduced
in openshift/installer#9640.

Author: jaypoulz

utils.sh

@@ -258,6 +258,7 @@ function node_map_to_install_config_hosts() {
              boot_mode="UEFI"
       fi
 
+
       cat << EOF
       - name: ${name}
         role: ${node_role}
@@ -304,6 +305,13 @@ EOF
 }
 
 function node_map_to_install_config_fencing_credentials() {
+  TNF_ENABLED_RELEASE=4.19
+
+  # If we didn't support TNF in this release, we skip rendering the fencing block
+  if is_lower_version "$(openshift_version "${OCP_DIR}")" "$TNF_ENABLED_RELEASE"; then
+    return 0
+  fi
+
   if  [[ -z "${ENABLE_ARBITER:-}" ]] && [[ "${NUM_MASTERS}" -eq 2 ]]; then
 	cat <<EOF
   fencing:
@@ -320,7 +328,14 @@ EOF
       address: ${address}
       username: ${username}
       password: ${password}
-      sslInsecure: true
+EOF
+      # We don't support overriding certificateVerification in 4.19
+      if [ $(openshift_version "${OCP_DIR}") == "$TNF_ENABLED_RELEASE" ]; then
+        continue
+      fi
+
+      cat <<EOF
+      certificateVerification: $([ node_val ${idx} "driver_info.disableCertificateVerification" | tr '[:upper:]' '[:lower:]' == "true" ] && echo -n "Disabled" || echo -n "Enabled")
 EOF
 	done
 	fi