No longer include mysql::server for dashboard.

* modules/openstack_project/manifests/dashboard.pp: The dashboard
module already includes mysql::server, so removing it here to get
rid of the duplicate declaration error. The mysql:server module
already subscribes to the conf.d directory, thus removal of the
redundant notify which otherwise ends in a circular dependency
graph. The puppet:/// URL is also correct now.

Change-Id: If1117375b9900e90eab5f7ba3335563991571682
Reviewed-on: https://review.openstack.org/29716
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins