virtcontainers: Remove the Network PostAdd method

It's used once by the sandbox code and can be implemented directly
there.

Signed-off-by: Samuel Ortiz <s.ortiz@apple.com>

src/runtime/virtcontainers/network.go

@@ -211,9 +211,6 @@ type Network interface {
 	// RemoveEndpoint removes one single endpoint from the sandbox's network.
 	RemoveEndpoint(context.Context, *Sandbox, int, bool) error
 
-	// PostAdd is a post networking endpoint addition hook.
-	PostAdd(context.Context, bool) error
-
 	// Run runs a callback in a sandbox's network.
 	Run(context.Context, func() error) error
 

src/runtime/virtcontainers/network_linux.go

@@ -339,32 +339,6 @@ func (n *LinuxNetwork) Add(ctx context.Context, s *Sandbox, hotplug bool) error
 	return nil
 }
 
-func (n *LinuxNetwork) PostAdd(ctx context.Context, hotplug bool) error {
-	if hotplug {
-		return nil
-	}
-
-	if n.eps == nil {
-		return nil
-	}
-
-	endpoints := n.eps
-
-	for _, endpoint := range endpoints {
-		netPair := endpoint.NetworkPair()
-		if netPair == nil {
-			continue
-		}
-		if netPair.VhostFds != nil {
-			for _, VhostFd := range netPair.VhostFds {
-				VhostFd.Close()
-			}
-		}
-	}
-
-	return nil
-}
-
 // Remove network endpoints in the network namespace. It also deletes the network
 // namespace in case the namespace has been created by us.
 func (n *LinuxNetwork) Remove(ctx context.Context) error {

src/runtime/virtcontainers/sandbox.go

@@ -826,7 +826,27 @@ func (s *Sandbox) createNetwork(ctx context.Context) error {
 }
 
 func (s *Sandbox) postCreatedNetwork(ctx context.Context) error {
-	return s.network.PostAdd(ctx, s.factory != nil)
+	if s.factory != nil {
+		return nil
+	}
+
+	if s.network.Endpoints() == nil {
+		return nil
+	}
+
+	for _, endpoint := range s.network.Endpoints() {
+		netPair := endpoint.NetworkPair()
+		if netPair == nil {
+			continue
+		}
+		if netPair.VhostFds != nil {
+			for _, VhostFd := range netPair.VhostFds {
+				VhostFd.Close()
+			}
+		}
+	}
+
+	return nil
 }
 
 func (s *Sandbox) removeNetwork(ctx context.Context) error {