feat(qemu): support two CD/DVD images and consistent ISO handling

gns3server/controller/node.py

@@ -58,6 +58,7 @@ IMAGE_PROPERTIES_BY_NODE_TYPE = {
         "hdc_disk_image": "qemu",
         "hdd_disk_image": "qemu",
         "cdrom_image": "qemu",
+        "cdrom2_image": "qemu",
         "initrd": "qemu",
         "kernel_image": "qemu",
         "bios_image": "qemu",
@@ -900,6 +901,7 @@ class Node:
                 "hdc_disk_image",
                 "hdd_disk_image",
                 "cdrom_image",
+                "cdrom2_image",
                 "bios_image",
                 "initrd",
                 "kernel_image",