Ensures $keystone_wsgi_script_path right permissions.

Closes-Bug: 1645299

In the case of more restrictive, system-wide umask setting,
directory $keystone_wsgi_script_path may become inaccessible for
web-server resulting in keystone failures.

Change-Id: I4cdc053bb88da0a7c2604ff0b431de57e24b41eb
(cherry picked from commit 4f15fb64b1)

manifests/wsgi/apache.pp

@@ -261,6 +261,7 @@ class keystone::wsgi::apache (
     ensure  => directory,
     owner   => 'keystone',
     group   => 'keystone',
+    mode    => '0755',
     require => Anchor['keystone::install::end'],
   }