Brings in Matt's openstack-ops-database work

Just bring in Matt's original work on the ops-database
cookbook.

Corrects what I think was a typo for the database service
role name attribute from openstack::role::database to
openstack::database::server_role

Brings in Berksfile and Gemfile and stubbed specs to pass
gates. Also sets version to 7.0.0 to match semantic versions
of openstack project cookbooks.

Change-Id: Idc02435ff7d3ff4b8a04c2bfc5abbb1e3091cb68