Merge pull request #187 from sakshiarora13/devel

Issue #183: Fix validation to allow for single node installs

roles/cluster_validation/tasks/validations.yml

@@ -27,10 +27,4 @@
   assert:
     that: "groups['compute'] | length | int >= 1"
     fail_msg: "{{ compute_group_fail_msg }}"
-    success_msg: "{{ compute_group_success_msg }}"
-
-- name: Manager and compute groups should be disjoint
-  assert:
-    that: "groups['manager'][0] not in groups['compute']"
-    fail_msg: "{{ disjoint_fail_msg }}"
-    success_msg: "{{ disjoint_success_msg }}"
+    success_msg: "{{ compute_group_success_msg }}"