VOL-1041 Show serial_number in vcli devices instead of vendor_id

Change-Id: I8300f1045aee1deb578f45a58b34e733a02625b1
diff --git a/cli/main.py b/cli/main.py
index 7674182..c9d9bee 100755
--- a/cli/main.py
+++ b/cli/main.py
@@ -190,7 +190,7 @@
             'hardware_version',
             'images',
             'firmware_version',
-            'serial_number'
+            'vendor_id'
         }
         print_pb_list_as_table('Devices:', devices, omit_fields, self.poutput)