Add customization for wsgi process display name

when ceilometer api is deployed in httpd, however
 the process name is like '/usr/sbin/httpd -DFOREGROUND',
it is ambiguous and make monitoring more difficult.
the aodh, gnocchi module are also like that.
so we should set an appropriate name for wsgi process.

Change-Id: I5e8c9be062a88e9ed6442e6cbce6573fba385030
Related-Bug: #1626550

manifests/wsgi/apache.pp

@@ -99,6 +99,10 @@
 #   (optional) Name of the WSGI daemon process.
 #   Defaults to $name
 #
+# [*wsgi_process_display_name*]
+#   (optional) Name of the WSGI process display-name.
+#   Defaults to $name
+#
 # [*wsgi_process_group*]
 #   (optional) Name of the WSGI process group.
 #   Defaults to $name
@@ -162,6 +166,7 @@ define openstacklib::wsgi::apache (
   $user                      = undef,
   $workers                   = 1,
   $wsgi_daemon_process       = $name,
+  $wsgi_process_display_name = $name,
   $wsgi_process_group        = $name,
   $wsgi_script_dir           = undef,
   $wsgi_script_file          = undef,
@@ -206,6 +211,7 @@ define openstacklib::wsgi::apache (
     group        => $group,
     processes    => $workers,
     threads      => $threads,
+    display-name => $wsgi_process_display_name,
   }
   $wsgi_script_aliases = hash([$path_real,"${wsgi_script_dir}/${wsgi_script_file}"])
 

spec/defines/openstacklib_wsgi_apache_spec.rb

@@ -80,6 +80,7 @@ describe 'openstacklib::wsgi::apache' do
           'group'        => 'keystone',
           'processes'    => 1,
           'threads'      => global_facts[:os_workers],
+          'display-name' => 'keystone_wsgi',
         },
         'wsgi_application_group'      => '%{GLOBAL}',
         'require'                     => 'File[keystone_wsgi]',
@@ -119,6 +120,7 @@ describe 'openstacklib::wsgi::apache' do
             'group'        => 'keystone',
             'processes'    => '37',
             'threads'      => '8',
+            'display-name' => 'keystone_wsgi',
         },
         'wsgi_process_group'          => 'keystone_wsgi',
         'wsgi_script_aliases'         => { '/' => "/var/www/cgi-bin/keystone/main" },