[FUP] Update sriov_pf.yaml samle with ethtool_opt

This change updates sriov_pf.yaml sample file with a
usage example of ethtool_opt attribute that was added
to sriov_pf port type.

Change-Id: Ib12901d5fad51ac40d2a9d8cdc13919b7d64c92e
Depends-On: https://review.opendev.org/#/c/664780
(cherry picked from commit 7668abb300)

etc/os-net-config/samples/sriov_pf.json

@@ -5,7 +5,8 @@
             "name": "p2p1",
             "numvfs": 10,
             "use_dhcp": false,
-            "promisc": true
+            "promisc": true,
+            "ethtool_opts": "speed 1000 duplex full"
         },
         {
             "type": "sriov_pf",

etc/os-net-config/samples/sriov_pf.yaml

@@ -14,6 +14,8 @@ network_config:
     # Allow all the traffic received. It might be needed when one of its VF
     # is attached to a ovs bridge. Default: true
     promisc: true
+    # Set ethtool options (optional)
+    ethtool_opts: "speed 1000 duplex full"
 
   -
     type: sriov_pf