added references to the ~/.apigee/credentials.yml file

installations/two-region-installation/validations/opdk-setup-validate.yml

diff --git a/installations/two-region-installation/validations/opdk-setup-validate.yml b/installations/two-region-installation/validations/opdk-setup-validate.yml
index 861f295..3ed2d6d 100644
--- a/installations/two-region-installation/validations/opdk-setup-validate.yml
+++ b/installations/two-region-installation/validations/opdk-setup-validate.yml
@@ -1,6 +1,8 @@
 ---
 - hosts: '{{ hosts }}'
   serial: 1
+  vars_files:
+  - ~/.apigee/credentials.yml
   roles:
   - apigee-opdk-setup-default-settings
   - apigee-opdk-setup-validate
@@ -9,6 +11,8 @@
 
 - hosts: '{{ hosts }}'
   serial: 1
+  vars_files:
+  - ~/.apigee/credentials.yml
   roles:
   - apigee-opdk-setup-default-settings
   - apigee-opdk-setup-validate-cleanup