Modify roles in cheaha.yml playbook to enable a standalone proxy

This will enable a standalone VM to interact with Bright cluster so that it can act as a proxy for services. eg. OOD,SSH etc.

Implements #126 (closed)

Need to fix #125 before merging it

ansible/roles/ldap_config/tasks/main.yml

@@ -33,10 +33,11 @@
     - { src: ca.pem }
     - { src: ldap.key }
     - { src: ldap.pem }
+  when: "'proxy' not in group_names"
 
 - name: Copy ldap config into place
-  ansible.builtin.copy:
-    src: nslcd.conf
+  ansible.builtin.template:
+    src: nslcd.conf.j2
     dest: /etc/nslcd.conf
     owner: root
     group: root