fix issue when there is no credentials applied

will need to add more dummy for aws and gcp when we add more public cloud demos

roles/install_demo/tasks/azure.yml

@@ -0,0 +1,16 @@
+---
+- name: add azure credential
+  tower_credential:
+    name: azure_credential
+    description: Azure Service Principle
+    organization: "{{ vars[demo].project.organization }}"
+    state: present
+    kind: azure_rm
+    subscription: "{{ my_subscription }}"
+    tenant: "{{ my_tenant }}"
+    client: "{{ my_client }}"
+    secret: "{{ my_secret }}"
+    tower_username: "{{ my_tower_username }}"
+    tower_password: "{{ my_tower_password }}"
+    tower_host: "{{ my_tower_host }}"
+    validate_certs: false