Added internal_users template

roles/opendistro/opendistro-elasticsearch/templates/internal_users.yml.j2

@@ -0,0 +1,21 @@
+---
+# This is the internal user database
+# The hash value is a bcrypt hash and can be generated with plugin/tools/hash.sh
+
+_meta:
+  type: "internalusers"
+  config_version: 2
+
+# Define your internal users here
+
+admin:
+  hash: "{{ admin_password }}"
+  reserved: true
+  backend_roles:
+  - "admin"
+  description: "admin user"
+
+kibanaserver:
+  hash: "{{ kibanaserver_password }}"
+  reserved: true
+  description: "kibanaserver user"