Add service ports, ssh port, SNAT rule in nftables

ref: INF-138

Change-Id: I94a80467b30416a288b4a2ac6325427123df4d7d
diff --git a/molecule/default/prepare.yml b/molecule/default/prepare.yml
new file mode 100644
index 0000000..51a37b2
--- /dev/null
+++ b/molecule/default/prepare.yml
@@ -0,0 +1,29 @@
+---
+# netprep molecule/default/prepare.yml
+#
+# SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+# SPDX-License-Identifier: Apache-2.0
+- name: Prepare
+  hosts: all
+  become: true
+  vars:
+    acme_username: "www-data"
+    vhosts:
+      - name: "port8080.example.com"
+        insecure_port: 8080
+      - name: "port8081.example.com"
+        insecure_port: 8081
+  pre_tasks:
+    - name: Install testing related packages
+      apt:
+        name:
+          - netplan.io
+          - udev
+          - python3-pip
+        update_cache: true
+    - name: Install Docker SDK for Python
+      pip:
+        name: docker
+  roles:
+    - docker
+    - nginx