[CORD-2327] overriding head_credentials_dir in local scenario

Change-Id: If992cbb7000bcc9549cba540c006eae6c960dfda
diff --git a/scenarios/local/config.yml b/scenarios/local/config.yml
index 5913bc2..c5082ed 100644
--- a/scenarios/local/config.yml
+++ b/scenarios/local/config.yml
@@ -23,6 +23,7 @@
 # head = config in local scenario
 head_cord_dir: "{{ config_cord_dir }}"
 head_cord_profile_dir: "{{ config_cord_profile_dir }}"
+head_credentials_dir: "{{ credentials_dir }}"
 
 xos_tosca_url: "http://127.0.0.1:9102"