refactor ansible code in to ansible-2.0 folder, and created space for ansible-2.10

ansible-2.0/roles/vbox-guest/tasks/main.yml

@@ -0,0 +1,11 @@
+---
+# install virtual box guest additions on ubuntu16.04
+
+- name: install system packages
+  apt:
+    state: present
+    name: "{{item}}"
+    update_cache: yes
+  with_items:
+    - virtualbox-guest-dkms
+  when: ansible_virtualization_role == "guest"