vendor: Update govmm to disable vhost when host doesn't support vhost-net

If the length of vhostfds is zero, it means host doesn't support vhost. So
do not pass vhost="on" in QMP.
Full list:
    1a1fee7 qemu/qmp: nic can works without vhost

Fixes #169

Signed-off-by: Ruidong Cao <caoruidong@huawei.com>

Gopkg.lock

@@ -123,11 +123,11 @@
   revision = "3520598351bb3500a49ae9563f5539666ae0a27c"
 
 [[projects]]
-  digest = "1:7434a85a1d6c2bf64f322087ec7a7f84ab9e971179bef7b95deabaf0e3f7c126"
+  digest = "1:2b062c3645f86b71bdb0487b4d69746704695fc09158fe4638c213d38c6cc5dc"
   name = "github.com/intel/govmm"
   packages = ["qemu"]
   pruneopts = "NUT"
-  revision = "e2c716433e444017507e3587ce071868fd164380"
+  revision = "032705ba6aae05a9bf41e296cf89c8529cffb822"
 
 [[projects]]
   digest = "1:01c37fcb6e2a1fe1321a97faaef74c66ac531ea292ca3f929b7189cc400b1d47"

Gopkg.toml

@@ -52,7 +52,7 @@
 
 [[constraint]]
   name = "github.com/intel/govmm"
-  revision = "e2c716433e444017507e3587ce071868fd164380"
+  revision = "032705ba6aae05a9bf41e296cf89c8529cffb822"
 
 [[constraint]]
   name = "github.com/kata-containers/agent"

vendor/github.com/intel/govmm/qemu/qmp.go

@@ -812,13 +812,15 @@ func (q *QMP) ExecuteNetdevChardevAdd(ctx context.Context, netdevType, netdevID,
 // Must be valid QMP identifier.
 func (q *QMP) ExecuteNetdevAddByFds(ctx context.Context, netdevType, netdevID string, fdNames, vhostFdNames []string) error {
 	fdNameStr := strings.Join(fdNames, ":")
-	vhostFdNameStr := strings.Join(vhostFdNames, ":")
 	args := map[string]interface{}{
 		"type": netdevType,
 		"id":   netdevID,
 		"fds":  fdNameStr,
-		"vhost":    "on",
-		"vhostfds": vhostFdNameStr,
+	}
+	if len(vhostFdNames) > 0 {
+		vhostFdNameStr := strings.Join(vhostFdNames, ":")
+		args["vhost"] = "on"
+		args["vhostfds"] = vhostFdNameStr
 	}
 
 	return q.executeCommand(ctx, "netdev_add", args, nil)