Fix wsgi_user and wsgi_group in Red Hat platforms

Commit da0cedce6f assumed that the
user and group for Horizon in Red Hat platforms was 'dashboard', due
to the following lines being present in openstack-dashboard.conf:

WSGIDaemonProcess dashboard
WSGIProcessGroup dashboard

Actually, based on [1], this does not mean that, and the RPM packages
do not create such user, so we should switch that to the apache user.

[1] http://modwsgi.readthedocs.io/en/latest/configuration-directives/WSGIDaemonProcess.html

Change-Id: I52766ac0521951cc8c857e51a61823410585bed5

manifests/params.pp

@@ -17,8 +17,8 @@ class horizon::params {
       $root_url                    = '/dashboard'
       $apache_user                 = 'apache'
       $apache_group                = 'apache'
-      $wsgi_user                   = 'dashboard'
-      $wsgi_group                  = 'dashboard'
+      $wsgi_user                   = 'apache'
+      $wsgi_group                  = 'apache'
       $memcache_package            = 'python-memcached'
     }
     'Debian': {

manifests/wsgi/apache.pp

@@ -171,14 +171,8 @@ class horizon::wsgi::apache (
   Package['horizon'] -> Package['httpd']
   Concat[$::horizon::params::config_file] ~> Service['httpd']
 
-  $unix_user = $::osfamily ? {
-    'RedHat' => $::horizon::params::apache_user,
-    default  => $::horizon::params::wsgi_user
-  }
-  $unix_group = $::osfamily ? {
-    'RedHat' => $::horizon::params::apache_group,
-    default  => $::horizon::params::wsgi_group,
-  }
+  $unix_user  = $::horizon::params::wsgi_user
+  $unix_group = $::horizon::params::wsgi_group
 
   file { $::horizon::params::logdir:
     ensure  => directory,

spec/classes/horizon_wsgi_apache_spec.rb

@@ -200,8 +200,8 @@ describe 'horizon::wsgi::apache' do
         :root_url          => '/dashboard',
         :apache_user       => 'apache',
         :apache_group      => 'apache',
-        :wsgi_user         => 'dashboard',
-        :wsgi_group        => 'dashboard',
+        :wsgi_user         => 'apache',
+        :wsgi_group        => 'apache',
         :unix_user         => 'apache',
         :unix_group        => 'apache' }
     end