Make Apache vhost respect X-Forwarded-Proto header

Without this, some OpenStack services will return invalid URLs if
you are using SSL termination at a proxy in front of the service.

Change-Id: I3ee6b5838f4703e3b8b1b6632dd45c94057b2202
Closes-Bug: 1597935

manifests/wsgi/apache.pp

@@ -203,6 +203,7 @@ define openstacklib::wsgi::apache (
     docroot_owner               => $user,
     docroot_group               => $group,
     priority                    => $priority,
+    setenvif                    => ['X-Forwarded-Proto https HTTPS=1'],
     ssl                         => $ssl,
     ssl_cert                    => $ssl_cert,
     ssl_key                     => $ssl_key,

spec/defines/openstacklib_wsgi_apache_spec.rb

@@ -82,7 +82,8 @@ describe 'openstacklib::wsgi::apache' do
           'threads'   => global_facts[:processorcount],
         },
         'wsgi_application_group'      => '%{GLOBAL}',
-        'require'                     => 'File[keystone_wsgi]'
+        'require'                     => 'File[keystone_wsgi]',
+        'setenvif'                    => ['X-Forwarded-Proto https HTTPS=1']
       )}
       it { is_expected.to contain_concat("#{platform_parameters[:httpd_ports_file]}") }
     end