reverted default subtype example to VIRL V1.2.x

create-arista-veos-image/dynamic-subtype-vEOS-VIRL-Version-1.2.x.json

+{
+  "dynamic-subtypes": [
+    {
+      "cli_protocol": "ssh", 
+      "gui_icon": "iosvl2", 
+      "plugin_desc": "Arista vEOS", 
+      "interface_first": 1, 
+      "baseline_flavor": "vEOS.medium", 
+      "plugin_base": "generic", 
+      "interface_management": "Management1", 
+      "interface_pattern": "Ethernet{0}", 
+      "config_file": "/veos_config.txt", 
+      "hw_ram": 1024, 
+      "deprecated_use": "", 
+      "hw_vm_extra": "", 
+      "cli_serial": 1, 
+      "interface_range": 22, 
+      "config_disk_type": "disk", 
+      "plugin_name": "vEOS", 
+      "gui_visible": true, 
+      "baseline_image": "vEOS"
+    }
+  ]
+}
\ No newline at end of file

create-arista-veos-image/dynamic-subtype-vEOS-VIRL-Version-above-1.3.x.json

+{
+  "dynamic-subtypes": [
+    {
+      "plugin_base": "generic",
+      "device_type": "switch",
+      "plugin_desc": "Arista vEOS",
+      "cli_protocol": "ssh",
+      "plugin_name": "vEOS",
+      "cli_serial": 1,
+      "interface_range": 22,
+      "gui_visible": true,
+      "interface_pattern": "Ethernet{0}",
+      "baseline_image": "vEOS",
+      "config_disk_type": "disk",
+      "hw_ram": 2048,
+      "hw_vm_extra": "",
+      "gui_icon": "iosvl2",
+      "config_file": "/veos_config.txt",
+      "interface_first": 1,
+      "deprecated_use": "",
+      "baseline_flavor": "vEOS.medium",
+      "interface_management": "Management1"
+    }
+  ]
+}