Run 'keystone db_sync' as keystone user.

Running db_sync as root can cause permissions issues due to the fact
that the keystone log file gets owned as root
(/var/log/keystone/keystone.log).

This makes this module usable when using packages on Fedora 18.

Change-Id: I2c75db61474fb14f898c530bec2e8aad1230ad7c

manifests/init.pp

@@ -184,9 +184,11 @@
     # created
     exec { 'keystone-manage db_sync':
       path        => '/usr/bin',
+      user        => 'keystone',
       refreshonly => true,
       notify      => Service['keystone'],
       subscribe   => Package['keystone'],
+      require     => User['keystone'],
     }
   }
 }

spec/classes/keystone_spec.rb

@@ -89,11 +89,13 @@
       ) }
 
       it 'should only migrate the db if $enabled is true' do
-        if param_hash[:enabled]
+        if param_hash['enabled']
           should contain_exec('keystone-manage db_sync').with(
+            :user        => 'keystone',
             :refreshonly => true,
             :notify      => 'Service[keystone]',
-            :subscribe   => ['Package[keystone]', 'Concat[/etc/keystone/keystone.conf]']
+            :subscribe   => 'Package[keystone]',
+            :require     => 'User[keystone]'
           )
         end
       end