[CORD-2460]
Update and fix build documentation, fix variables with new TOSCA engine

Change-Id: I21b5e3aa2abda0111a72d1a994140ab2894296ce
diff --git a/roles/test-exampleservice/tasks/main.yml b/roles/test-exampleservice/tasks/main.yml
index 64f03d9..7028ae0 100644
--- a/roles/test-exampleservice/tasks/main.yml
+++ b/roles/test-exampleservice/tasks/main.yml
@@ -24,7 +24,7 @@
     method: POST
     headers:
       xos-username: "{{ xos_admin_user }}"
-      xos-password: "{{ xos_admin_pass }}"
+      xos-password: "{{ head_xos_admin_pass }}"
     body: "{{ lookup('file', head_cord_profile_dir + '/test-exampleservice.yaml' ) }}"
     status_code: 200
   tags: