nbd-proxy: Add dump offload device to nbd proxy config

This change defines /dev/nbd1 as a second endpoint, for a dump offload device

Signed-off-by: raviteja-b <raviteja28031990@gmail.com>
Change-Id: I946d7f14543270eb75a4d0a548cc5013ffcd6ced
diff --git a/config.sample.json b/config.sample.json
index 461046a..c81b00e 100644
--- a/config.sample.json
+++ b/config.sample.json
@@ -6,6 +6,12 @@
             "metadata": {
                 "description": "Virtual media device"
             }
+        },
+        "1": {
+            "nbd-device": "/dev/nbd1",
+            "metadata": {
+                "description": "Dump Offload"
+            }
         }
     }
 }