Merge pull request #865 from rsmitty/coreos-family-vars

remove assertion for family not being CoreOS

roles/kubernetes/preinstall/tasks/pre-upgrade.yml

@@ -2,7 +2,3 @@
 - name: Stop if non systemd OS type
   assert:
     that: ansible_service_mgr == "systemd"
-
-- name: Stop if obsolete CoreOS family fact value
-  assert:
-    that: ansible_os_family != "CoreOS"