Add CORS header to quickstart log server config

This allows the new javascript log viewing functionality to work
in the quickstart configuration.

Change-Id: Iecdff40ddae9f2e5080613e6c289bd84d6f1bb29

doc/source/examples/httpd.conf

@@ -286,6 +286,8 @@ DocumentRoot "/usr/local/apache2/htdocs"
     # Controls who can get stuff from this server.
     #
     Require all granted
+
+    Header set Access-Control-Allow-Origin "*"
 </Directory>
 
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