Force directory deletion in zuul.pp.

* modules/openstack_project/manifests/zuul.pp: Force the removal of
/var/lib/zuul/www, /opt/jquery-visibility, and /opt/jquery-graphite as
these are directories and puppet will not remove them without the force
option. Remove /var/lib/zuul/www recursively allowing us to remove
specific management for files in that dir. Also, align whitespace in
that section of zuul.pp while we are touching the file.

Change-Id: Iae2af7aba08e7ddb0f7e359287de253b7d212ada
Reviewed-on: https://review.openstack.org/26268
Reviewed-by: Paul Belanger <paul.belanger@polybeacon.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins