Allow limiting virtual media emulator to one IP family

It's a common case by customers. Requires:
- https://review.opendev.org/c/openstack/sushy-tools/+/956904

Author: dtantsur

04_setup_ironic.sh

@@ -228,6 +228,10 @@ if [ "$NODES_PLATFORM" = "libvirt" ]; then
              "${VBMC_IMAGE}"
     fi
 
+    if [[ -n "${REDFISH_EMULATOR_VIRTUAL_MEDIA_IP_FAMILY:-}" ]]; then
+        echo 'SUSHY_EMULATOR_VIRTUAL_MEDIA_IP_FAMILY = "${REDFISH_EMULATOR_VIRTUAL_MEDIA_IP_FAMILY}"' | sudo tee -a "$WORKING_DIR/virtualbmc/sushy-tools/conf.py"
+    fi
+
     if ! is_running sushy-tools; then
         sudo podman run -d --net host --privileged --name sushy-tools --pod ironic-pod \
              -v "$WORKING_DIR/virtualbmc/sushy-tools":/root/sushy -v "/root/.ssh":/root/ssh \

config_example.sh

@@ -440,6 +440,12 @@ set -x
 #
 #export REDFISH_EMULATOR_IGNORE_BOOT_DEVICE=False
 
+# REDFISH_EMULATOR_VIRTUAL_MEDIA_IP_FAMILY
+# Instruct the Redfish emulator to accept only virtual media images of the
+# provided IP familty.
+# Choices: 4, 6
+#export REDFISH_EMULATOR_VIRTUAL_MEDIA_IP_FAMILY=
+
 # VM_TPM_EMULATOR -
 # Add TPM2.0 emulator to VMs.
 # Default is unset