This change adds tests cases for the default roles keystone
supports at install time. It also modifies the policies for the
credentials API to be more self-service by properly checking
for various scopes.
Closes-Bug: 1788415
Partial-Bug: 968696
Change-Id: Ifedb7798c96930b6cc0f91159a14a21ac4b02f9f
Lance Bragstad