EP lock shouldn't be held when trying network lock

Signed-off-by: Santhosh Manohar <santhosh@docker.com>

libnetwork/endpoint.go

@@ -683,8 +683,8 @@ func (ep *endpoint) deleteEndpoint() error {
 }
 
 func (ep *endpoint) getSandbox() (*sandbox, bool) {
-	ep.Lock()
 	c := ep.network.getController()
+	ep.Lock()
 	sid := ep.sandboxID
 	ep.Unlock()