builder: set externalkey option for faster hook processing

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit 1ad272c7e409476fd50fc701d45329b1e05bdec9)
diff --git a/builder/builder-next/executor_unix.go b/builder/builder-next/executor_unix.go
index b3ea33c..9f26642 100644
--- a/builder/builder-next/executor_unix.go
+++ b/builder/builder-next/executor_unix.go
@@ -63,13 +63,13 @@
 	defer close(iface.ready)
 	id := identity.NewID()
 
-	ep, err := n.CreateEndpoint(id)
+	ep, err := n.CreateEndpoint(id, libnetwork.CreateOptionDisableResolution())
 	if err != nil {
 		iface.err = err
 		return
 	}
 
-	sbx, err := c.NewSandbox(id)
+	sbx, err := c.NewSandbox(id, libnetwork.OptionUseExternalKey())
 	if err != nil {
 		iface.err = err
 		return