Add role level tests for 'nginx' role

Introduce full role level test coverage for
'nginx' role.

Change-Id: I7c634775433a2336e43cdfc73d4698d5e2933f0e
Issue-ID: OOM-1913
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
diff --git a/ansible/roles/nginx/molecule/default/playbook.yml b/ansible/roles/nginx/molecule/default/playbook.yml
new file mode 100644
index 0000000..431bb66
--- /dev/null
+++ b/ansible/roles/nginx/molecule/default/playbook.yml
@@ -0,0 +1,5 @@
+---
+- name: Converge
+  hosts: all
+  roles:
+    - nginx