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

Change-Id: I21b5e3aa2abda0111a72d1a994140ab2894296ce
diff --git a/roles/create-epc/defaults/main.yml b/roles/create-epc/defaults/main.yml
index 542f13d..13a4aec 100644
--- a/roles/create-epc/defaults/main.yml
+++ b/roles/create-epc/defaults/main.yml
@@ -16,6 +16,9 @@
 
 # roles/create-epc/defaults/main.yml
 
+head_credentials_dir: "/opt/credentials"
+
 xos_admin_user: "xosadmin@opencord.org"
-xos_admin_pass: "{{ lookup('password', '/opt/credentials/xosadmin@opencord.org') }}"
-epc_blueprint: "build"
\ No newline at end of file
+head_xos_admin_pass: "{{ lookup('file', head_credentials_dir ~ '/' ~ xos_admin_user) }}"
+
+epc_blueprint: "build"