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/defaults/main.yml b/ansible/roles/nginx/defaults/main.yml
index 260de9b..8bf4419 100644
--- a/ansible/roles/nginx/defaults/main.yml
+++ b/ansible/roles/nginx/defaults/main.yml
@@ -4,7 +4,7 @@
   http:
   nexus:
 all_simulated_hosts:
-    "{{ simulated_hosts.git + simulated_hosts.http + simulated_hosts.nexus }}"
+  "{{ simulated_hosts.git + simulated_hosts.http + simulated_hosts.nexus }}"
 
 nginx:
   ports: