Facilitate testing PRs from an external repo hosted on GH

Closes #129 (closed)

This will enable us to define the upstream and downstream repos along with their respective branches that need to be set as an external repo (i.e. hosted external to gitlab for eg. Github) for this project to function.

ansible/group_vars/all

@@ -4,9 +4,32 @@
   yum_repo_files: []
   pkg_list: []
   slurm_version: 18.08.9
-  
+  enable_slurm_client: false
+
 # 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: ""
+
+# cheaha.node related
+  hostname_lookup_table:
+    - "10.141.255.254 master.cm.cluster master localmaster.cm.cluster localmaster ldapserver.cm.cluster ldapserver"
+  domain_search_list:
+    - openstack.internal
+    - cm.cluster
+  nameserver_list:
+    - 10.141.255.254
+
+# ldap_config related
+  ldap_cert_path: "/etc/openldap/certs"
+  ldap_uri: "ldap://ldapserver"
+
+# nfs_mounts related
+  use_autofs: false
+  mount_points:
+    - /gpfs4
+    - /gpfs5
+