Update and normalize OpenStackID dev DB creds

* manifests/site.pp: Start using hiera for openstackid-dev's
id_mysql_user parameter for consistency.

* modules/openstack_project/manifests/openstackid_dev.pp: TipIt is
moving the openstackid-dev server to new Trove databases, so update
the database names accordingly. Also null out the lingering default
values which we're filling from hiera in site.pp.

Change-Id: Id1b3b17751a34d3e760a789bf23c3ebea9c8c606
Merge "Update and normalize OpenStackID dev DB creds"