Pin ara at 0.16.5 for logserver

With the ARA 1.0.0 release, it has been rearchitected in ways which
require more extensive changes to the way it's deployed. For now,
pin it to use the previous version.

Change-Id: Iadfc699e6a4ce1de1a90bf4accb916454b788df0

manifests/logserver.pp

@@ -219,7 +219,7 @@ class openstackci::logserver (
 
   if $ara_middleware {
     package { 'ara':
-      ensure   => 'latest',
+      ensure   => '0.16.5',
       provider => 'openstack_pip',
       require  => [
         Package['build-essential'],