Replace omnibus_updater with chef_client_updater

omnibus_updater is deprecated

site-cookbooks/kosmos-base/metadata.rb

@@ -12,5 +12,5 @@ depends 'sudo'
 depends 'kosmos-postfix'
 depends 'hostname'
 depends 'firewall'
-depends 'omnibus_updater'
+depends 'chef_client_updater'
 depends 'timezone-ii'

site-cookbooks/kosmos-base/recipes/default.rb

@@ -9,9 +9,11 @@
 
 include_recipe 'timezone-ii'
 
-node.override['omnibus_updater']['version']              = '12.19.36'
-node.override['omnibus_updater']['kill_chef_on_upgrade'] = false
-include_recipe 'omnibus_updater'
+# Update chef to the chosen version
+chef_version = '12.19.36'
+chef_client_updater "Install #{chef_version}" do
+  version chef_version
+end
 
 package 'mailutils'
 node.override['unattended-upgrades']['admin_email'] = 'ops@5apps.com'