DodoApp: Use one network per external customer

Change-Id: I09864ad24a223b451c5877ad08bbc8960c80d41c
diff --git a/core/installer/cmd/dodo_app.go b/core/installer/cmd/dodo_app.go
index 5fc6e3e..f6d9c43 100644
--- a/core/installer/cmd/dodo_app.go
+++ b/core/installer/cmd/dodo_app.go
@@ -195,6 +195,7 @@
 		nsc,
 		jc,
 		env,
+		!dodoAppFlags.external,
 	)
 	if err != nil {
 		return err