Fix $log_dir permissions

Commit 3cbb6ba8ff06d8e2b68e00d44b86c3b6a8f64870 changed permissions to
puppet's` $log_dir` that
are incompatible with passenger configuration (See puppet's issues:
[#13914](http://projects.puppetlabs.com/issues/13914) and
[#13931](http://projects.puppetlabs.com/issues/13931)).

Even if not writing to the file, puppetmaster fails to start if it can't set
permssions to file masterhttp.log
Merge branch 'fix_passenger_permissions'