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/group_vars/all

@@ -4,9 +4,20 @@
   yum_repo_files: []
   pkg_list: []
   slurm_version: 18.08.9
-  
+
 # NHC related
   nhc_download_url: "https://github.com/mej/nhc/releases/download/1.4.3/lbnl-nhc-1.4.3-1.el7.noarch.rpm"
   nhc_download_path: "/tmp"
   nhc_git_repo: "https://gitlab.rc.uab.edu/rc/nhc.git"
   nhc_git_repo_path: "/tmp/nhc"
+
+  root_ssh_key: ""
+
+  hostname_lookup_table:
+    - "172.20.0.24 cheaha-master02.cm.cluster cheaha-master02"
+    - "172.20.0.22 cheaha-master01.cm.cluster cheaha-master01"
+    - "172.20.0.25 master.cm.cluster master localmaster.cm.cluster localmaster ldapserver.cm.cluster ldapserver"
+
+  bright_openldap_path: "/cm/local/apps/openldap"
+  ldap_cert_path: "{{bright_openldap_path}}/etc/certs"
+