Fix for www/py-graphite-web pkg-message

[Xavier]

The message for post-install tasks for graphite-web is outdated,
manage.py is no more part of django

Here is a patch :

===================================================================
--- pkg-message.in.origin       2018-11-26 19:23:57.876958000 +0100
+++ pkg-message.in      2018-11-26 19:25:19.358946000 +0100
@@ -7,8 +7,8 @@

 * Initialize the sqlite user database and create the admin user:

-       python2 %%PYTHON_SITELIBDIR%%/graphite/manage.py syncdb
-
+       django-admin.py migrate --settings=graphite.settings --run-syncdb
+       django-admin.py createsuperuser --settings=graphite.settings
 * Build the index:

         %%PREFIX%%/bin/build-index.sh
===================================================================

Regards,

Xavier

-- 
Xavier Humbert - sysadmin & network engineer