[CORD-2327]
Define `credentials_dir` as it is in `platform-install` repo

Change-Id: I90cf186bb3b5fdf6f0f70efc0f57dbacf4207a5a
(cherry picked from commit efd2f4185c5c89feeb3ff4c0955c9e0936e50ec8)
diff --git a/scenarios/local/config.yml b/scenarios/local/config.yml
index c5082ed..993926f 100644
--- a/scenarios/local/config.yml
+++ b/scenarios/local/config.yml
@@ -19,6 +19,7 @@
 # create a cord_profile dir next to the cord checkout
 config_cord_dir: "{{ ( playbook_dir ~ '/../..' ) | realpath }}"
 config_cord_profile_dir: "{{ ( playbook_dir ~ '/../../../cord_profile' ) | realpath }}"
+credentials_dir: "{{ ( playbook_dir ~ '/credentials' ) | realpath }}"
 
 # head = config in local scenario
 head_cord_dir: "{{ config_cord_dir }}"